TL;DR: Tried updating OS using flashable zip thru TWRP, didn't work so used fastboot method, got it working on stock but can't restore nandroid backup (not even /data partition), have app data that I need, what can I do?
Background
I picked up the Nexus 6 not too long ago and I soon decided to unlock the bootloader, install a custom recovery, and root it. Thanks to the info here on XDA, that was painless. A few weeks ago, I got a notification for an OTA update. Having read that OTA updates no longer work for modified /system partitions, I knew that I wouldn't be able to update it.
I ignored the update for a while until I finally decided to look into how I could make the update yesterday. I really didn't want to deal with setting up the device the way I like it again so I was hoping to find a method that didn't nuke the /data or /data/media partitions. I found what looked to be the easiest method which entailed flashing a zip from TWRP.
What I Did
I ran a nandroid backup before doing anything and naively figured that would be enough. Afterwards, I wiped the system and caches for what I thought would be "good measure", flashed the zip, and was surprised to see that TWRP was reporting no OS was installed. I was under the impression that the system partition was going to be overwritten.
To make it short, I tried restoring from the nandroid backup but it would fail at the system part with TWRP reporting something along the lines of '/system is read only'. I hopped on fastboot, flashed the images provided by Google, and was back on stock. I tried restoring the backup once again but to no avail. I even tried restoring just the data partition but that didn't go well either.
Much Regret Section
Now, I know I should have backed up the apps separately with something like Titanium Backup but I had a lapse in judgement and assumed I could just revert back if anything went wrong. Unfortunately, I have applications with data that I can't easily get back. I tried using Nandroid Manager to restore applications from the backup but, as with past experience with the app, not all data is recovered.
Is there anything that I could try to either revert back to that backup or at least get the applications in data back the way they were prior to updating?
Background
I picked up the Nexus 6 not too long ago and I soon decided to unlock the bootloader, install a custom recovery, and root it. Thanks to the info here on XDA, that was painless. A few weeks ago, I got a notification for an OTA update. Having read that OTA updates no longer work for modified /system partitions, I knew that I wouldn't be able to update it.
I ignored the update for a while until I finally decided to look into how I could make the update yesterday. I really didn't want to deal with setting up the device the way I like it again so I was hoping to find a method that didn't nuke the /data or /data/media partitions. I found what looked to be the easiest method which entailed flashing a zip from TWRP.
What I Did
I ran a nandroid backup before doing anything and naively figured that would be enough. Afterwards, I wiped the system and caches for what I thought would be "good measure", flashed the zip, and was surprised to see that TWRP was reporting no OS was installed. I was under the impression that the system partition was going to be overwritten.
To make it short, I tried restoring from the nandroid backup but it would fail at the system part with TWRP reporting something along the lines of '/system is read only'. I hopped on fastboot, flashed the images provided by Google, and was back on stock. I tried restoring the backup once again but to no avail. I even tried restoring just the data partition but that didn't go well either.
Much Regret Section
Now, I know I should have backed up the apps separately with something like Titanium Backup but I had a lapse in judgement and assumed I could just revert back if anything went wrong. Unfortunately, I have applications with data that I can't easily get back. I tried using Nandroid Manager to restore applications from the backup but, as with past experience with the app, not all data is recovered.
Is there anything that I could try to either revert back to that backup or at least get the applications in data back the way they were prior to updating?
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