Unable to boot ReadyNas Duo - best recovery option?

So I've had my ReadyNAS Duo for probably 10 years now, crazy to think. It's been rock solid. A couple weeks ago, I went to access my drive and the drive could not connect. I also had issues getting to the admin page. If I recall, I believe it was almost like page could not be found and I couldn't ping it either. It was in la la land, but the device was on and no visual indicators it had a problem. So I just shutdown by holding the blue button and waited to turn it back on. A few minutes later, I turned it on, waited for the boot process and hurray, my disk was available...

While I haven't been in the admin for a while, I decided I better go check the health of everything. Got the usual prompt about the logs and I went to take a look. I saw that the logs were full of how the backup didn't run because the previous job was still running. I went to click another area in the admin and got a connection refused page. That was odd. I tried to reconnect to the page and still a refused to connect. I went back to try and access the drive on my computer and again, couldn't access the drive any longer. I could still ping the device and the device itself looked normal. I have a newer computer so I had to install RAIDar utility. It showed healthy, green checks for drives and correct IP (firmware was blank). Puzzled, I rebooted the ReadyNAS again. This time it seemingly took forever to reboot, pretty much 2 days before it showed up healthy. However, could not get to drive and could not load admin page. I could ping fine. I read a few threads here and decided to see what I could recover...

Good/bad news is I do have a backup running, however, looking at the data it looks like the last successful backup was in March. I don't have a TON of stuff added, but I did have some things missing from the backup. Don't always count on your backups I guess, but at least I had 99%.So I shutdown the ReadyNAS again, took out the disks to do a health check. Disk 1, primary was all good, Disk 2 parity did come back with warnings of Current Pending Sector Count. I did utilize the R-Linux tool to extract the data off of the drive, but the formatting is full of random files that I will have to parse through...

So once that was done, I put the drives back in and it's still booting. Going on 3 days now. RAIDar still shows system starting up and green checks by drives. I do know firmware is old, I'd guess circa 2014 is the last time I updated. My question is, while I'm not going to be super concerned of having to start over, how do I try and recover "normally". I've seen an OS reinstall and also putting new disks in to update firmware and putting old disks back in or even just running on disk 1. Are any good options and what do I potentially lose by doing so? Also, is it harmful to shutdown again even though it's still "booting"? Sorry for the long post.