The Internet Archive is a digital library. Due to copyright restrictions, you cannot simply search "MAME 0.139u1 ROMs" and find an official page. Instead, you need to look for "Non-Profit Preservation" or "Historical Software" collections.
Open your mobile browser (or PC to transfer later) and go to archive.org. Use the search term: mame4droid 0139u1 roms archiveorg install
"MAME 4 droid 0.139u1 roms"
Look for a collection uploaded by a user named "mame4droid" or "arcade-belgium" – these are trusted sources. The description should explicitly state "Non-merged" and "For MAME4droid." The Internet Archive is a digital library
Solution: This is almost always a version mismatch. Delete the ROM and download it again from a source that explicitly says "MAME 0.139u1." "MAME 4 droid 0
When searching Archive.org, look for collections titled similar to "MAME 0.139 ROMs" or "MAME 2010 Reference Set."
Solution: MAME4droid has per-game settings. While the game is running, tap the screen to bring up the in-game menu. Go to "Video Options" or "Audio Options" and try changing the "Frame Skip" or "Sound Sample Rate." For 0.139u1, set "Audio Latency" to 2.0.