When I try to do it via Xperia companion it says that this model is unsupported (Xperia m c1905), fastboot reset won't work, and tried flashing stock software via flashtool, but cannot, still getting errors with like 10+ tested .tft files. Phone after turning on is unusable because the "app stopped" messages are popping on screen and the only thing I can see beyond these popups is a black background. Safe mode isn't changing anything.
How can I get a usable phone if every method I know failed. Please, help me, someone.