Good evening. I've flashed a lot of MIUI ROMS from xiaomi.eu without a problem, but today, while upgrading my Mi4C from 7.8.31 to 7.9.7 (manual donwload, using the updater app), the phone just switched off. I didn't get any warning about battery before starting the process, and I'm sure it didn't finished: it just got black and (I think) off. It doesn't respond to any key combination to get into recovery or fastboot mode, and plugging it to a laptop results in "cannot retrieve hardware descriptor". Linux says more, throwing USB error -110, that means the laptop cannot power the device enough to make it work. Connecting it to AC makes no difference (by the moment). No charging led, no battery loading animation if I press the power button. What can I do at this point? Is there any way I can try to revive it and reflash? Have I lost the content?