You need to be rooted with no system mods or custom recovery images
Be careful to download from the ACTUAL web host, not the phishing site! You are supposed to end up with zip files. Malware is also being hosted on devhost, as people have been reporting
Sorry, not really in the mood to write down newbie friendly steps, maybe someone can consolidate them. I don't check my PMs...
From now it would be great if someone generously backs up their fota folder every time until we get a new tot leak.
How to Force OTA dlpkgfile install
Some details of how to follow the force OTA procedure for D800. You MUST be on a stock LG G2 D800 firmware:
Copy dlpkgfile into /cache/fota/, chmod dlpkgfile to 666. Again this file gets deleted after the update.
If /cache/recovery folder does not exist, create it. This folder is automatically removed after the update. chmod it to 777 because it doesn't matter.
Write the cache command to recovery. With adb under root user, run:
echo "--update_package=/cache/fota/dlpkgfile" > /cache/recovery/command
am start -n com.lge.lgfota.permission/com.lge.lgfota.permission.DmcEzUpdateStart
1) 20c fresh
Guide to go to 20c (D80020c): http://forum.xda-developers.com/show....php?t=2663369. If you are coming from a custom ROM, chance are that you need the special DLL to force the flash.
2) root 20c
Towelroot get root on 20c: https://towelroot.com/
You could set SuperSU to OTA survival mode, not sure if this is actually needed
Choose one of the two from below:
3a) 20c -> 20y (force OTA, see above)
3b) 20c -> 20k (force OTA, see above)
20k -> 20u (force OTA, see above)
20u -> 20y (force OTA, see above)
Result = 100% stock rooted 20y without waiting for AT&T. Process to do each incremental update shouldn't take more than 20 minutes total.
* * *
Other fixes if you don't have the AT&T SIM available
AT&T address book contacts hijacking:
*#*#2666#*#* and setting "registration" to "completed"
Enable wifi tether:
20k from 20c
20u from 20k
20y from 20u or 20c
Thanks to oddhours (http://forum.xda-developers.com/member.php?u=815149) for sharing the 20u to 20y update
30f from 20y