I have one of those that I bricked via a botched firmware upgrade, knocked it off my desk while it was writing. The error message yours is giving means the cart's firmware is out of date. If you can find an older version of the kernel (the software/files you put on the sd card) online that might work, otherwise it's possible to use ysmenu instead of the 'official' r4i-sdhc software. See:
https://gbatemp.net/threads/ysmenu-for-r4-sdhc.187663/ That should at least let you use the cart again. Hope this helps a little.