Bakhtiari can be written in more than one script. It can be written in the same script as English or Farsi.
Here is one of my orthographies, and a comparison with Rahmanian’s orthography and the International Phonetic Alphabet.
Rahmanian, Gholam Hossein, “Spoken Bakhtiari” (1978). MA TESOL Collection. Paper 292. http://digitalcollections.sit.edu/ipp_collection/292/
| IPA | Rahmanian’s graphemes | Reza’s graphemes |
| a | ā | aa |
| æ | a | a |
| ɛ | e | e |
| ɪ | i | i |
| o | o | o |
| u | u | u |
| i | ee | i (final) |
| au | ou | |
| ei | ai | |
| oo | ||
| b | b | b |
| d | d | d |
| f | f | f |
| ɡ̟? | g | g |
| h | h | h |
| dʒ | j | j |
| k | k | k |
| l | l | l |
| m | m | m |
| n | n | n |
| p? | p | p |
| s | s | s |
| t | t | t |
| v | v | v |
| w | ||
| j | y | y |
| z | z | z |
| ɹ / ɾ | r | r |
| tʃ | ch | |
| ʃ | sh | sh |
| ð | th | |
| ʒ | zh | |
| gh | ||
| ŋ | ng | |
| x | kh | kh |
| ɛ | eh |