If you dumped before writing (like you should have) just rebuild using the correct key and reflash it using etheir xell (if that still boots) or using hardware flasher like NAND-X or similar
Otherwise just use xeBuild GUI with the key you built with to extract kv etc. put them in the data directory (all decrypted variants of them without the name part that says if it's encrypted or decrypted (kv.bin, smc.bin, smc_config.bin)) then just build with the correct key...