Try running the command prompt manually and running the flashall.bat from there to see error messages.
Because TCL (the manufacturer) and BlackBerry moved on years ago, finding a legitimate autoloader is like a digital archaeological dig. The user heads to CrackBerry or dedicated subreddits like blackberry key2 autoloader
Avoid random "autoloader generator" websites or paid unlock tools. Many contain malware or corrupted images. Try running the command prompt manually and running