Zinwa.com they put all new internals why it works they sell a kit so you can open yours up and replace motherboard with the new one. The specs on old Blackberrys would struggle hard trying run modern Android. Only Blackberry i saw rooted recently was the Blackberry Key 2 https://xdaforums.com/t/rom-15-unofficial-beta-athena-lineageos-22-2-for-blackberry-key2.4777062/. Really old specs so does not run the greatest I tested it out.