Repositories like The New 1+8G Board on AliExpress or Facebook Tech Groups often host these files for repair purposes.
1366x768 (HD) and 1920x1080 (Full HD)
TP.MT5510I.Pb801 Firmware (WALTON) Price:500 tk Call - Facebook Download MT5510I PB801 1366X768 JVC REF30 part05 rar