Guys, please help me solve this problem. I have a Chinese version of the Mi15. When I flash a firmware update to a Xiaomi .eu, my second SIM card doesn't work—that is, there's no signal. When I flash a global firmware update and use the same modem as the one in the supposedly broken Xiaomi .eu, both SIM cards work fine. How to fix this?
https://www.reddit.com/r/Xiaomi_15/s/exOxacQlCz
In this post, I wrote about solving the problem with the convex back cover.
After a few days, the water resistance remained the same as it was after gluing it on, meaning it's truly waterproof, but the back cover is sticking out again. The only solution is to either look for a convex 2.5D back cover like the one on the Mi 14, wait for AliExpress to make one, if they figure out the problem in China or physically remove the wireless charging coil. The Mi 14 back cover would have worked if Xiaomi hadn't changed the placement of the sensors and LEDs.
Guys, the Mi15's back cover tends to come loose over time, not because the battery is bulging—well, primarily because the Xiaomi is such idiots that they replaced the Mi14 glass cover, which had a convex back cover, with a completely flat. That's why there's no room under the back cover for wireless charging, and it puts pressure on the back cover right near the power button in a straight line to the opposite side, causing the back cover to bend and bulge. I solved this problem this way: I removed the factory adhesive and applied the back cover to a transparent Relife RL-035A. I used a lot of clamps and placed the phone on the charger to keep it warm and allow the adhesive to dry better. Ultimately, I restored the water resistance even better than before the re-gluing, and the back cover no longer bulges. Incidentally, the battery didn't bulge, as expected.