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samedi 19 septembre 2015

Broken, non-working touch screen - how to relock bootloader, reset tamper flag?



My nexus 5's display somehow cracked while it was in my pocket. The glass itself is not cracked - the display and touch related components underneath the glass cracked. I don't really understand how it happened, but it did. The screen is now totally unusable. The display is super garbled. It didn't register touch before; now it seems to register touch, but it's totally unpredictable and seems to register touches randomly for no reason. It seems to be covered under warranty since the display wasn't destroyed by a drop and there's no obvious problem with the glass, but I'm trying to reset the phone to stock everything before sending it back to Google.

I managed to use wugfresh's toolkit to reset the phone to stock via fastboot (flash stock rom + unroot). I still need to lock the bootloader. For whatever reason, that option in Wugfresh toolkit doesn't appear to be working for me from fastboot (it tries to boot the modified boot.img, but then my phone just ends up booting into the installed rom).

I would like to lock the bootloader in a way that resets the tamper flag. Most of the guides I see talk about needing to boot into TWRP via fastboot and flashing the BootUnlocker script. I can't actually do that though because 1) my touchscreen doesn't work, so I can't use TWRP , and 2) I'm not sure how I would get the BootUnlocker script onto my phone's internal storage, given that I can't finish the phone's set up to get storage working, nor can I enable USB debugging mode, because that would require using the screen.

Does anybody have any ideas on how to reset the bootloader and the tamper flag from fastboot alone, without a working touchscreen?

Thanks!



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