Errors in your query:
1. The lock state information is not a firmware specific state unless you have a cracked firmware which ignore this data hence it wouldn't be "original"
2. If you have bought a phone you have an original firmware in it.
3. There are several original firmwares yet if I try to read behind the lines you are looking for an unbranded firmware. The last original unbranded firmware was Z500XAED1. They are not produced anymore as mobile companies has bought up the rights. There are custom unbranded firmwares though.
Reading some more behind the lines you are looking for an unlocker and a flasher. Please use the SEARCH function.