How to Distinguish A1 vs. A2?You must determine if your AVA Developer System is A1 or A2 before performing any firmware updates, as they require different versions of firmware. WARNING: Irreversible data loss or system damage may result when updating with the wrong firmware versions. Determining A1 / A2 Remove its glass casing by unscrewing the 2 screws at the right side of its rear panel. 2. To distinguish between A1 vs. A2, please check if your carrier board has “COM-HPC Server Carrier” imprinted on it, as exemplified below. If it does, it is A1. If it doesn’t, it is A2. Take note of whether your system is A1 or A2, and only update your system’s firmware accordingly. WARNING: Irreversible data loss or system damage may result when updating with the wrong firmware versions.