If this was a Kobo reader with operating system on removable internal SD card recovery would be easy. In years past it was common for a few bold T1 owners "want to be hackers" bricking their T1 reader. Sony didn't support this or make it easy. Sony Reader Dev Corner Threads on Mobile Read Forums often had pleas for help recovering their Bricked T1. You might find help from old thread or get helpful response there.
https://www.mobileread.com/forums/forumdisplay.php?f=141