The link below is the firmware and upgrade tool for the X5 max. Please open and download.
Please contact me if you encounter problems during the upgrade process. I will try my best to serve you.
Note if your computer system is in French. Please change the name of the downloaded file.
When upgrading firmware, do not select the "Format All + Download" option
When the phone flashes, install the software first, turn off the phone, and connect the phone to the computer.
@Aleksey Vasilyev Here is the flash link for your phone model