Hello,
please browse to your AS3.0.90 folder and delete (first make a backup of all files you delete !) following files:
- Within “…\Upgrades” the setup of the module
- Within “…\AS\Firmware” the whole folder of the module
- Within “…\AS\Hardware\Modules” the XML file of the module
After this it should be possible to install the older Firmware upgrade again
To be honest I cannot try as AS3.0.90 is way too old to install on my Win10 Laptop but the files above mentioned should be enough