[Android General] tudor.raneti:
I've started installing custom roms for P920 and opened a can of worms having ultimately to find the original firmware to fix my IMEI, signal, camera and others

What stock firmware can I flash on P920 that doesn't break my phone's functionality? I've flashed v20d because it said it's LG's latest recommendation for P920 by using search by IMEI here :https://lg-roms.com/?id=, but that didn't restore any of my functionality until I installed v10L, a french orange rom probably identical to my original one, so I don't know if now I install v20d again that it won't break my stuff again

Need help from someone who upgraded successfully to tell me what to properly flash. Thank you

P.S. Also, are v2, v3, v4 firmwares for LG better for it's battery life? I've installed a v4 custom rom that burned through my battery just idling...

EDIT: changed tactic for picking my target Android. My main criteria is longest battery life, beside getting a firmware that works for p920. I'm amazed how hard is to get a straight answer for minimum system requirements but I've found a credible answer here: https://www.intel.com/content/www/us/en/support/education/intel-education-software/000006179.html which tells me not to install v4 or higher on p920 ever - in fact I run a cyanogenmod rom and was very sluggish. Because v3 is one for tablets and brings nothing meaningful according to my criteria, that only leaves gingerbread (v2.3) and froyo (v2.2) to pick from

Also, this comparison helps: http://socialcompare.com/en/comparison/android-versions-comparison

Also a good read: https://arstechnica.com/gadgets/201...rbread-four-years-later-the-os-just-wont-die/

Then the question becomes since I'm already on v2.2, what v2.3 P920 original firmware I can flash w/o losing imei, networking, airplane mode etc.? I seem to believe from all I read that I simply lost that functionality because I've installed custom roms in between, and I can install any P920 original firmware but need confirmation

EDIT2: experiment:

battery test in idle airplane mode: 1 a.m. 100%

battery test in idle airplane mode: 9:30 a.m. 94%, that's 0,63% / hour. BootV21E from the unbricking tutorial lost 75% in ~12 hours, like 1000% more because airplane mode didn't work, and so did the other roms I tried. That's the difference between proper firmware and improper firmware

EDIT3: installed v20d because it seems the right firmware: https://lg-roms.com/official-firmware/LG Optimus 3D-LGP920/V20D/ROMANIA

seems everything is working. Testing battery again on airplane mode. I must say froyo looks better than gingerbread theme :) Must change...

LG specs are full of shat about battery on stanby (460 hours or ~20 days): http://www.gsmarena.com/lg_optimus_3d_p920-3759.php

EDIT4: v20d

battery test in idle airplane mode: 13:11 p.m. 95%

battery test in idle airplane mode: 20:43 p.m. 93%, that's 0,26%-0,4% / hour.

EDIT5: v20d

battery test in idle airplane mode: 20:43 p.m. 93%

battery test in idle airplane mode: 15:38 p.m. 88%, that's ~0,29% / hour, that's 344 hours in a 100%, which is 460/344 = ~33% battery degradation in 5 years (according to spec, didn't measure battery actually resisted 460 hours on idle)

consuming (idle mode)