Please download the latest FWs from following links
V01.26.34.00 Release Note (signed firmware)
V01.26.37.00 Release Note (signed firmware)
Firmware upgrade procedure can be found in section 3.5.1 of installation manual.
NB unzip the file before uploading and do factory reset after firmware upgrade.
Signed firmware cannot be downgraded to older, non-signed firmware (versions below V01.26.31.00).