[Please help] Cubot X15 Bricked (MT6735)
[Please help] Cubot X15 Bricked (MT6735)
(17-10-2016, 11:54 PM)dreadpirateroberts Hi,First Rob the battery terminal and the battery plates with cotton and then
I managed to put my Cubot X15 into a boot loop by trying to install Kingroot and SuperSu. Booting into recovery and 'Factory Reset' only wiped user data but did not fix corrupt system partition.
I then downloaded SP Flash Tool and the 'Stock' ROM from the links at forum.cubot.net . When I tried to flash this rom using 'Firmware Upgrade', I got a 'Success' message but my phone hard bricked. No power, no recovery, no response to charging, not recognised by Windows 7. Any further attempt to flash was met with "BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032) [EMI] Enable DRAM fail".
I have since downloaded a number of ROMs from needrom.com and have managed to flash version X15-19 from that site. After this the preloader works when I use VOL-UP + POWER but nothing happens when I choose any option, just the screen blanks. The phone responds to a charger but nothing more.
I have been using SP Flash Tool v5.1640 for linux 64bit from https://androidmtk.com/smart-phone-flash-tool on Ubuntu 13.10.
I also attempted to install a cwm recovery but with no success. It seems the preloader does not find the next stage (neither boot nor recovery.
Any suggestions?
(18-10-2016, 10:47 AM)dreadpirateroberts So I charged the phone overnight, then booted into CWM recovery and did a backup of the phone. Rebooted to normal mode and phone is back in action. However, when I reboot into recovery mode, it is stock recovery, CWM recovery is gone.
Also, I enablet 'allow root' and 'usb debug' in developer settings. Even after doing that, I cannot unlock the bootloader. I use 'sudo fastboot oem unlock' and the phone prompts "yes / no". I answer "yes" but it fails with "not allowed".
I presume this is part of why CWM recovery disappears after a reboot.
(19-10-2016, 09:26 PM)dreadpirateroberts Phone chipset is MT6735, Android is 5.1 (no more info than that in 'About Phone').
I had OEM unlocking (and USB debug) enabled though it shows up disabled again after a reboot.
I flashed the phone again, this time with the latest ROM X15-19. After this flash, I enabled OEM unlock and USB debugging. I then rebooted into Fastboot mode and, from Ubuntu did 'fastboot oem unlock'. The phone prompted 'Yes / No' and I answered 'Yes'. This time the unlock was successful and, on reboot, user data was wiped.
I rebooted into stock recovery to restore my user data, rebooted, ran a 'root check' app which said the phone is not rooted.
I then flashed a CWM recovery which showed up on boot but disappeared on reboot. It did offer to root the phone (installing /usr/bin/su and dropping me into Fastboot mode).
I'm not clear on whether an OEM unlock is sufficient to root the phone by itself or if I have to do something else too? Also, can I restore my user data which was backed up by stock recovery using any other tool? CWM recovery did not offer me the chance while testing.