DC112A firmware update fails reopen

The following thread appears closed for new comment so i started this thread since the firmware update failure problem is still unresolved by netgear.

https://community.netgear.com/t5/Mobile-Routers-Hotspots-Modems/DC112A-firmware-update-fails/td-p/1790351/page/2

To confirm I have DC112A-2RDMES for Oreedoo purchased on ebay in good faith currently with firmware V1.0.0.14_1.0.60 and I need to update it to the latest available firmware promised by Netgear that is 1.0.0.42_1.0.60 due to serious security bugs. Currently any attempt to update the firmware to the latest available for this model as confirmed by Netgear results in failure with message: "Firmware is invalid"