I bought a new HTC One from T-Mobile in Poland, branded with CID T-MOB101 and Hboot 1.44. Everything worked fine but the phone still had Android 4.1.2 and no update available. I decided to get rid of the brand and get international stock version to be able to receive OTAs. I unlocked bootloader with htcdev.com, installed TWRP 22.214.171.124, achieved s-off using revone, changed CID to HTC___001 and used RUU_M7_UL_JB_50_HTC_Europe_1.28.401.7_Radio_4A.13. 3231.27_10.31.1131.05_release_310878_signed . My phone did not see OTA so I applied updates manually in following order:
OTA M7 UL JB 50 S HTC Europe 2.24.401.8-2.24.401.1 Release 331108tottoh71qygw07hf
OTA M7 UL JB43 SENSE55 MR HTC Europe 3.62.401.1-2.24.401.8 Release 338160gxmo5sd9337kadux
After each OTA i tried to look for updates in phone's settings and found only two little updates (few MBs) that did not lead to bigger ones; I believe it was after first and third OTA.
After all this I started having WiFi issues. The phone stayed connected to my WiFi the whole time but after few minutes pages would not load, games would not connect. Resetting the connection would help for another few minutes (or less). Factory reset seemed to help a bit, the WiFi was able to keep the connection yet it 'paused' from time to time. By 'pause' I mean lose the connection for a second and regain right after, e.g. I could connect to games such as Hay Day, but after a ~minute I would lose the connection and have to reconnect (in game, without touching phone's settings) and redo last X seconds of game.
Because of that I went and applied ARHD 31.6 custom rom and hoped for the best. The situation remained the same so I flashed ARHD 41.0, yet the problem still remains.
In the end I downgraded my Hboot so it goes back to 1.44 and used the RUU I used the first time, after that I changed CID back to T-MOB101 and applied my full backup I saved by booting (prior to flashing) TWRP before I changed anything in the phone.
I did full wipe every time I changed the system and I did factory reset multiple times.
As of now I am on my backup with
Version 126.96.36.199 CL175271 release-keys
and my WiFi is unstable. I can browse internet, watch YouTube or do things like that, yet I cant play games requiring constant internet connection, such as Hay Day.
So my question is: What do I do to get it to work as it used to at the beginning? I would prefer having the newest Android version, but at this point I simply need a working phone so if anyone has a solution that would work on my current system or by flashing a new one I will be extremely grateful.