HTC EVO 4G :: Bootloop After Flashing Kernals
Oct 2, 2010
I have tried flashing several kernals with different ROMs, but more often than not, my phone just ends up restarting over and over. after i boot it, when i flash the kernal, I would be playing with it then all of a sudden it would freeze up on me and start boot looping. I have cleared the dalvik and cache before flashing ROMs and kernal. I rooted via 3.21 unrevoked and it says on the top of hboot s-off. The only kernal that has worked is netarchy-toastmod 4.1.8 bfs. any idea what i could be doing wrong?
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Oct 22, 2010
Flashing kernals is new to me although general rooting is not. Apparently with my new Inc I have the slcd which will only work with a few kernals. What I had to do to get some new ROMs working was flash the ROM, then flash a specific kernal before booting up. That worked and I was able to flash some ROMs that I was not previously able to use. It has come to my attention that there are some kernals out there that are better for battery life so my questions are:
1) If I want to flash a new kernal over my existing ROM can I just do that? Boot into recovery and flash the new kernal? (After a nandroid of course.) Or do I have to flash the ROM again, then flash the new kernal and then boot up? Do I need to wipe anything before flashing a new kernal?
2) What are the best kernals for battery life that work with the slcd screen?
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Jul 25, 2010
I just put Froyo 2.2 on my Moto Droid using this ROM: http://androidforums.com/roms-droid/127966-rom-stable-android-2-2-frg01-clean-untouched-virgin.html
And I used the 800mHz kernal found here:
How To: Get Android 2.2 (Froyo) On Your Motorola Droid Right Now! | TheUnlockr
I am experiancing a few freezing problems and bad start ups, but I am assuming these kind of surprises come with flashing different ROMs/kernals onto your phone. I noticed, however, that occasionally my screen will get really "twitchy" e.g. when I press a key on the android on screen keyboard it types the letter 4 times. or when i drag the notifications bar down half way and keep my finger still i can see the bar twitch up and down rapidly. I have heard from several review sites that twitchiness and stuttering usually have to do with the processing, which made me think of the kernal change. Does this mean i picked a bad kernal or a bad speed? If i get this twitching does it mean get a faster kernal or a slower kernal?
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Aug 31, 2010
I did the gscript way on rooting the phone and that was a success but when I'm trying to flash the Plain Jane rom it would work but then when needing to be restarted it would just go into bootloop like have the ERIS screen then appear with the Plain Jane over the top of it and just repeat itself forever. What am i doing wrong?
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Aug 2, 2010
I'm about to travel a couple of hours to an interview and I need the phone working. I flashed it, then rebooted and its been stuck on the white evo screen for over a half hour. Its not rebooting constantly so i don't think this is a 'bootloop' per se. What do I do? Pull the battery?
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Jun 25, 2012
Cant enter recovery as that reboot loops the cyanogenmod image, can I maybe use a custom flasher and flash the euro open BIN?
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Jan 4, 2014
to get out of bootloop that occured due to flashing zip file via CWM on my micromax canvas 2 plus phone which is the safest way ? I dont want to lose any data...
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Jul 28, 2010
Can someone explain to me what a kernal is? and how do you flash things, like this kernal? ([WIP] [7/7] Higher framerate on Novatek panels | Kernel inside | Now for Froyo! - xda-developers) and does anyone know if Fresh 1.0.1 disables preflocks? and if it does, whats the downside of "flashing" fresh 1.0.1?
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Jul 5, 2010
ok so i get that everyone's phone reacts differently to different kernals. but what i'd like to know is what if i got a kernal that yields great results as far as performance, but drains the battery to quickly? im using chevy's ulv 1.25. will using set cpu to scale it back to 1.1 be as beneficial as using a new 1.1 kernal?
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Aug 23, 2010
I'm still new to this Rooting so I have a question. I've tried about 14 different ROMs over the past month or so. My Eris always freezes up when I set the OC past 787mhz. I have read where some people are using Kernals that let them OC past 800. Is this something I can flash to my Eris or is my Eris just limited to 787?
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Oct 5, 2010
flashed a new rom using rom manager. i thought i remembered seeing options to download from a list of kernals?
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Jun 17, 2010
I recently installed one of Chevy's low voltage kernels a few days ago and have since experience extremely laggy performance, random reboots, and terrible battery life compare to what I used to get before I installed it. And most of that stuff has been happening even when I have it maxed at 550. How do I go about uninstalling this kernel?
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Jul 28, 2010
I just got my droid (ONLY the droid, no battery, backplate, or charger) lol. I know irritating right. Well since I have a couple days before everything comes that I need, i am contemplating on which ROM to put on it. I have done some reading and seems that the majority of people are happy with BB (right?)
But my question is:
What about Kernals? I have heard to flash new Kernals for overclocking and such, but should I flash a different Kernal or do the ROMS already have the fastest Kernal installed on them? Not sure if this question makes sense, but I'm just trying to get the fastest ROM & Kernal available for my Droid.
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Jul 16, 2010
Where can I installed the hydra kernals?
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Jul 18, 2010
I'm bout to root, and wanna run a Hydra kernel, but I wanna know if the recent OTA could mess with the way the kernels work. More specifically the fact that the OTA brought 802.11N with it, yet the kernel has the option for it. Should I not use the Hydra with N? Just want to make sure having the OTA won't mess with any functionality of a custom kernel.
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Jul 28, 2010
I have search for the best ROM, even in the rating thread and have not found a consistent consensus of what people think. I am looking for the newest kernals and the best ROM.
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Feb 22, 2010
I am sure its not to complicated but still I would like to be filled.
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Oct 29, 2010
I rooted my Droid incredible 2 days ago so bare with me as I am still trying to understand all this new terminology and get the fullest use out of my phone. I was wondering about Kernals, overclocking and underclocking. I would like to increase my battery life as we all know how crappy it can be under normal use. I am running Skyraider 3.3 now because I enjoy the stock look of the HTC sense and I am using ADW.launcher as well. I downloaded a kernal for Skyraider but I can't tell what the speeds are and change them up. I saw a program called setcpu for rooted users on the market. Anyone have any experience with this app and is it worth the money? I am not wanting to slow down the performance of my phone but I still want to be able to have a good battery life. Anyone have any suggestions for a kernal to use or anyone using setcpu have a suggestions for a good speed to use.
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Apr 1, 2010
I wanted to explore some of the different kernals in rom manager. LV vs MV, etc. Can I just install them on top of what I have? Do I have to remove a previous kernal some how, or just try them all out?
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Feb 24, 2010
I was wondering how they actually reach their max speed? If you have a kernal that has 250, 600, 800, 1000, 1200. Does it start at 250 then go 600, 800, 1000, then finally hit 1200? Or does it jump to the necessary speed that your using (like start at 250 then it could go to 1000 then 1200)? Because if it has to go through each speed to get to its max, then a kernal with 5 different ones would be much better than 10 wouldn't it? I've never seen this question asked before, so does anyone know how they actually get up to their max?
Just so everyone knows I'm rooted and running overclock of 1200.. I have it set up. Just want to know how it works.
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Jun 24, 2010
Can someone explain kernals? I recently rooted my phone and am running froyo, but I am still in the dark on what kernals are...
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Aug 5, 2010
I ask for some clarification on ROMs, radios, bootloaders and kernals.I am currently running a rooted stock incredible. I want to try CM6, the 2.2 leak, and the 2.2 lite or Sky Raider. I know there are issues with having the right radio and kernal with all these. If I understand it right, the stock kernal will work with all of them. If I wan't to try another kernal I would be limited to kernals made to get along with those specific roms. Is this correct?I have the 1.x radio right now, which will work with CM6 right? If I go to the 2.2 leak it will upgrade it to 2.x, which will work with 2.2 lite or Sky Raider. However I am I right in thinking to go back to CM6 or stock from 2.2 leak I will have to downgrade the radio? Also, I will have to downgrade the bootloader as well?Whew, this is all so confusing.
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Oct 2, 2010
i was wondering about the hydra kernals. I installed the latest overvolt hydra kernal. My question is when you go into idle, does it underclock for you? Or do you have to install undervolt to do that? Also can you install both overvolt and undervolt at the same time? (not literally at the same time but have both kernals at once to get the most power and battery saving?)
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Aug 21, 2010
I rooted today (unrevoked 3 + forever) and I did a nandroid backup (thank god) and titanium backup. I tried to flash the undervolt (0.5) and overclocked (0.1, #1) hydra kernals on the phone but it gets stuck at the boot up screens. Am I doing something wrong? I put the zip on the root of my SD card and used Clockwork to flash the zip file. Should I just upload the HTC .32 kernal?
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Sep 13, 2010
So Im running stock rooted frg22 and was wondering if I could put overclocked kernals like slayers or something over it because I want to overclock and am satisfied with the stock froyo rom.
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Apr 5, 2014
I had motorola defy before my xperia z. Defy had something called bootmenu which let me switch on adb while booting a ROM. Now i have xperia z, its bootloader unlocked, a rom cooked by my own which is in bootloop. It doesnt have bootmenu to do like i did for defy. How do i switch on adb from the phone's side? I have setup adb perfectly on my computer.
My ROM goes into bootanimation but adb doesnt seem to be switched on in the phone' side.
when i type "adb logcat log" it is stuck at "waiting for device " while the bootanimation goes on into bootloop
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Sep 16, 2010
I have a rooted evo, fresh 3.2, and noticed this morning that my sdcard wasnt mounting, so i did a hard reset and now am stuck in a bootloop, i can enter recovery and bootloader, but since sdcard is not mounting can not preform a nand restore any ideas?
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Dec 4, 2013
im building a rom base on aosp kitkat but it will not boot. It just get stuck on bootanimation.
Any way to logcat on bootloop or something?
What ways I have to troubleshoot the problem or the cause.
Atrix HD using ProBAM rom
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Jul 27, 2012
I installed an RUU with an update utility which fixed a WiFi problem I was having. Everything looked good so I immediately tried rooting with zergrush which seemed to work until my first re-boot. Now the phone is stuck in a boot-loop.
I have two utilities for RUU versions. I've flashed both of them at least three times each but its the result is the same every time. The phone boots normally the first time, then goes into loop on the next restart.
One issue that I noticed that when I re-lock the bootloader in fastboot, I get an error message. It goes something like...
(BOOTLOADER) Lock Successfully....
FAILED (unknown error)
However, when I go back to bootloader, it says **** RELOCKED **** at the top. Maybe whatever is causing the "unknown error" is also interfering with the re-lock procedure. It may not be truly re-locked.
I really just want to get this phone back to stock condition so that it works like it should.
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Nov 12, 2012
my phone is stuck in a bootloop. and its Not rooted. all i can do is go to the boot menu. I want to use ADB to see if i can read the phone data (like sms...). Is there any chance that the device will be recognized when i connect it to the PC by usb with ADB?? or is it impossible? maybe ADB needs the phone to be operating normally to be recognized.
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