Support and discussion for BMW CAS4 and CAS4+ Editor. Decrypt 5M48H and 1N35H read and edit ISN and Secret Key change VIN and mileage manage key slots set frequency 315 433 868 edit remote ID and run DME and EGS sync. Auto checksum fix on save. Works with XPROG-M UPA-S Orange5 VVDI Prog Rosfar. Also searched as CAS 4 and CAS4 plus.

BMW CAS4/CAS4+ Editor — 5M48H 1N35H Decrypt SK ISN VIN ODO — Community Help​

Free editor for encrypted CAS4 plus. Decrypt EEPROM for 5M48H and 1N35H then edit SK and ISN change VIN and odometer manage all eight key slots and sync with DME and EGS. Checksums corrected automatically.

Quick intro
This tool targets CAS4 plus with MC9S12XEP100 masks 5M48H and 1N35H. It opens encrypted dumps with a simple decrypt step then exposes core data for repair cloning and synchronization. Use Edit Data for VIN ISN mileage and key parameters or use DME and EGS ISN sync. Save to write corrected checksums and verify by re reading the file.

Click to expand...

Identify your module — CAS4 vs CAS4 plus

• CAS4 one L15Y uses a different editor
• CAS4 plus uses masks 5M48H or 1N35H and requires decrypt before any edits
• If unsure read the MCU mask on the board or check your dump

What is inside

• Overview and screenshots
• Change log and compatibility notes
• Guides for decrypt and edit workflow SK and ISN
• DME and EGS synchronization steps
• Key management tips frequency and remote ID
• Troubleshooting and known errors
• Download link and setup notes

Common questions

• Decrypt fails or file stays encrypted — confirm mask 5M48H or 1N35H and use a full and clean dump then retry
• ISN or SK not visible after decrypt — reopen the file and verify that the correct block was loaded
• Keys not detected — check slot status and frequency then rewrite key data and save
• Sync with DME or EGS fails — match ISN on both sides first then run sync again and cycle ignition
• Checksum warning — always save through the editor which repairs checksum automatically

Download and full details — CAS4 CAS4+ Editor 5M48H 1N35H