KM717 USB PROBLEMS after upgrade Firmware

HI !

Today updated my Dell Universal receiver firmware to the version Versión 1.4.1.3, A03, and my keyboard didn't work anymore, only work via Bluethooth but not via USB. I found this link https://www.dell.com/support/article/es-ar/sln319212/dell-wireless-keyboard-km717-km636-no-function-after-upgrade-dell-universal-receiver-firmware-updater-version-1-4-1-0-a00?lang=en

But I need downgrade Dell Universal receiver firmware to check if this version have the same problem.
Do some of you know where I can get it?

Thanks

Thanks