Compatibility notice:

LANCOM 1926VAG / 1926VAG-4G with MOD A00 support LCOS as of version 10.42. 

Due to changed component assembly the 1926VAG/ 1926VAG-4G with higher MOD version is only supported as of LCOS 10.50. Therefore a firmware downgrade to LCOS 10.42 on these devices is not possible.