Open a TED PES 2020 in https://wepes.github.io/ save as PES 2021 TED
And check all the ID in case they have to change any
For example ID Marco Reus cannot in a DB PES 2021 and need changing for work in PES 2021
ID Marco Reus 45944 replace for an ID of Fake Player example 54365
When you convert an ID to hex it stays this way
B378 for Reus D45D for Fake Player
But for Konami to read it correctly you have to write for this way
First the last 2 numbers and last the 2 numbers
Reus example: 78B3 and add 0000
78B30000
And Fake Player 45D4 and add 0000
45d40000
Replace with HXD and encrypt with PES2021PS4Tools
Import a TED and ready for play