Unable to downgrade the SRX220 firmware to any version below 10.3.
This applies to the following Junos platforms:
When a downgrade is attempted on a SRX220 to any version below Junos 10.3, the device aborts the upgrade with the following error message.
WARNING: Package junos-10.2R3.10-domestic is not compatible with this hardware. WARNING: Please install a package with version 10.3 or higher.
The lowest firmware version that can be run on the SRX220 is Junos 10.3R1. Any version below this is not supported on SRX220.