if serial number of your tablet begin with "U1006H"，you can use this firmware. if not,please try https://www.alldocube.com/en/firmware/iplay10pro-firmware-2/ or https://www.alldocube.com/en/firmware/iplay10pro-firmware/

https://mega.nz/file/cJkmiJoY#Ur0qyu04blyMXdEx_XDHQxIIGPsWR6W5gFxGXzwR9ZM firmware for T1021p

https://mega.nz/file/MRNkyCYZ#9aiojUUHS875JlS1Sg7M2ffVtsHIfe0uY2nTT8hdiEA https://mega.nz/file/1MtUESoC#c8UnKVVKF5hTlUs15hQF71_T5Mm963BFlrhHYyQ9rnI try these two new firmware

just  follow the tutorial:https://androidmtk.com/flash-stock-rom-using-smart-phone-flash-tool

Please click the "Tutorial" button on the left, follow the tutorial inside, write the firmware with mtk sp flash tool v6 tool