I use the 1.25.1 wallet to enter the burn n pubkey command and result.
Data must be hexadecimal string (not'pubkey') (code -8), how should I deal with it?
You generate pubkey at step 3.
For example, it's "PublicKey" : "a11188d9e5087156c3e7f2deeccfb9879a46d8fc49579c8fc3205319a4e31f0f"
and you want to burn 10 BLK. Your command is
burn 10 a11188d9e5087156c3e7f2deeccfb9879a46d8fc49579c8fc3205319a4e31f0f