KESS V2 software version 2.90, often paired with K-Suite 2.80, improves upon earlier versions by offering stable online operations, full protocol access, and automatic checksum correction for ECU tuning. This update supports KESS V2 FW 5.017 for vehicles up to roughly 2017 models, with official support scheduled to end in March 2026. For more technical details on this version, read the product information at AliExpress AliExpress KESSv2 Manuale M ENU | PDF | Electrical Connector - Scribd

• No ECU unlocking (encrypted MEVD17.2, EDC17C74, MD1, etc.) – requires original Alientech or other tools like PCMflash, Flex, or Magicmotorsport.
• Slow OBD writes – 20–45 minutes for a 2MB file.
• No checksum correction – you need WinOLS or similar.
• Poor TCU support – don’t buy for DSG/TCU tuning.

Contrast this with a KESS V2: Security failed on step 3, requiring bench removal of the ECU.

For tips on using tuning software and understanding version 2.90:

Official Transition

: For users needing even higher performance, Alientech now recommends the KESS3 , which is up to 7x faster and combines OBD, Bench, and Boot tuning into a single device.

Kess 290 New

KESS V2 software version 2.90, often paired with K-Suite 2.80, improves upon earlier versions by offering stable online operations, full protocol access, and automatic checksum correction for ECU tuning. This update supports KESS V2 FW 5.017 for vehicles up to roughly 2017 models, with official support scheduled to end in March 2026. For more technical details on this version, read the product information at AliExpress AliExpress KESSv2 Manuale M ENU | PDF | Electrical Connector - Scribd

• No ECU unlocking (encrypted MEVD17.2, EDC17C74, MD1, etc.) – requires original Alientech or other tools like PCMflash, Flex, or Magicmotorsport.
• Slow OBD writes – 20–45 minutes for a 2MB file.
• No checksum correction – you need WinOLS or similar.
• Poor TCU support – don’t buy for DSG/TCU tuning.

Contrast this with a KESS V2: Security failed on step 3, requiring bench removal of the ECU. kess 290 new

For tips on using tuning software and understanding version 2.90: KESS V2 software version 2

Official Transition

: For users needing even higher performance, Alientech now recommends the KESS3 , which is up to 7x faster and combines OBD, Bench, and Boot tuning into a single device. No ECU unlocking (encrypted MEVD17