Re: Thumbnails, and what creates them.

Bob Martin <bob.martin@excite.com> wrote:
[...]

I used to use TWRP to do a full backup of my Nexus phones.

  AFAIK, using TWRP for a full backup requires an unlocked bootloader
[1]. Normally the bootloader is locked, because an unlocked bootloader
is a security risk in case the phone falls into the wrong hands.

  For the same reason, on most phones unlocking the bootloader (via an
unlocking code from the manufacturer or third party) will do a factory
reset, deleting all the very programs and data you're trying to backup.
Catch-22.

  So how did you get to flash TWRP on your Nexus without these
problems?

[1] See for example:
'Is it necessary to unlock bootloader before flashing a recovery like
TWRP?'
<https://www.quora.com/Is-it-necessary-to-unlock-bootloader-before-flashing-a-recovery-like-TWRP>