I have a wrt1900ac-v1 and on the primary flash (the one currently in use) is installed a openwrt firmware image I compiled myself a few years back. Problem is now that I want to upgrade I can not do it through the normal sysupgrade .bin file. It says incomparable file although I am sure it is not. After some digging around it appears that for a while custom images with cryptodev enabled in the kernel can not upgrade normally.
This would normally be only a minor inconvenience. When I got this router I installed a 3.5mm jack connected to the UART serial connector for easy serial console access. Main issue is my USB-TTL serial convetor crapped out so I can not use that currently.
My question is: could I just write either the .bin or the .img firmware file directly to /dev/mtd6 (the alt firmware image space) as shown in the firmware flash layout while the system is running on the primary boot partition?
I really do not want to wait for another serial adaptor so any ideas please help.
btw i am not new here really. I have an account on here, believe the username is thermochromic but it uses my work email from an old job I no longer work at. Not a big deal but any chance I could recover that account without access to the email (and forgot the password lol)? Again not a big deal I was just curious.