Alientech KESS3 Upgrade 3.21 is now available!

New BOOT protocol support for Honda Keihin 38770-XXX ECUs has officially arrived.

• BOOT Mode Support

• OBD + BENCH + BOOT Access

• Supports Honda 125cc & 350cc models from 2021+

• Deeper ECU access for tuning and repair work

• More flexible engine management operations

Supported models include:

• Honda Monkey

• Honda SH

With this new update, KESS3 gives tuners even more flexibility — from quick OBD access to advanced BOOT operations directly on the ECU.