_p_jb_n_lolan_tr_a51.part1.rar

: Stock or custom ROMs used to update or repair a phone's operating system.

: This indicates the first segment of a "multi-part" or "spanned" archive. To extract the full contents, you generally need all subsequent parts (e.g., .part2.rar , .part3.rar ) in the same folder.

: Ensure you have downloaded every part of the set. If one is missing, the extraction will fail.