Showing posts with label messing. Show all posts
Showing posts with label messing. Show all posts

Monday, 11 July 2016

Bootloop from hell - messing around with kernels



Hi folks,

I had my G920P on PB6 base, with TWRP from here; http://forum.xda-developers.com/spri...amwin-t3335260, and installed TeamSPR 3.6 ROM (http://forum.xda-developers.com/spri...om-v3-t3380648). All was running dandy.

Then one day, I flashed @tdhite 's SkyHigh kernel (v3.2, can be grabbed here; http://forum.xda-developers.com/spri...ernel-t3350673). All was smooth.

Then I wanted to revert back to the default kernel that shipped with TeamSPR ROM, so extracted the boot.img from the ROM zip, and used Flashify (got latest from the Play Store) to flash it. This is where things went downhill. :(
Upon rebooting, and entering recovery, nothing happened. I don't recall what happened at this point (whether I rebooted, or went to flash SkyHigh zip again, because I was panicking?), but upon attempting to reboot, I entered this bootloop from hell, in which the ROM would not get past the "samsung" screen (I am assuming the equivalent of the Sprint LTE screen, since the TeamSPR ROM replaces that with the international screen :good:).

In desperation, I booted into recovery, made a nandroid backup, and took out everything I wanted out of the device.
Then, I went here; http://forum.xda-developers.com/spri...tore-t3366862/
got the latest (PF4) TAR (yes, MD5 checked out), wiped the phone from TWRP (system/data/cache/internal storage), and ODIN-ed that.
According to ODIN, all went without a hitch.
When the phone rebooted, it went into stock recovery, and it displayed a "applying update" message, followed by "erasing...", and then "applying update". And then, abruptly rebooted itself.
Bootup now went to the Sprint logo, and then "optimizing apps" green/teal screen (it optimizes 32 apps, for whatever it's worth). Almost instantly after the 32nd app is "optimized", the phone reboots again, and this bootloop restarts.
If I broke the loop by going to recovery (still stock recovery at this point), I am greeted again with with "applying update" message, but then I get the dreadful android with an exclamation point sign on top, undoubtedly having failed to apply whatever updated it was trying to do. :confused:
Pressing the power button at this stage, gets me to the stock recovery.
Here, I wiped cache, and did a factory reset. Both yielded no different behavior upon reboot from what has been outlined post-ODIN flash.
(I have tried versions 3.10.6 and 3.11.1 of ODIN, by the way - same result).


I got the latest TWRP available (link posted here; http://forum.xda-developers.com/spri...tore-t3366862/), wiped system/cache/data/internal storage, and installed TeamSPR ROM (but not their 3.6 OTA). Rebooted the device, but the device goes into bootloop again on the flashing "Samsung" screen, so back to square 1.


At this point, I am not sure what else to try. The phone is a paperweight at this point, and I am really hoping for it not to remain as such.

Ideas?

Thanks in advance!