Netgear EX6250v2 - reverting back to OEM firmware

Hi,

I have installed OpenWRT (23.05.2 and snapshot) on a NetGear EX6250v2 to test it.
The issue is that now I want to return to stock but I can't.
I have followed all the tutorials to do it with nmrpflash and TFTP, but there is no way.
Neither system is working for me.

I have LUCI access to the equipment without problems.

Is there a way to go back to stock firmware?

Regards,

https://openwrt.org/toh/hwdata/netgear/netgear_ex6250_v2

https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=73de41898fcd06d837b013449c370c493bcdc595