Cisco 3810 router - "no flash SIMM found"?

I had this 3810 voice router in a box and I decided to sell it, since I haven't used it in a while (several years). It boots up to a prompt, but it also boots to a router(boot)# command line. A show ver tells me it is booting to 0x2102 as it should. During the bootup, I get a line that says no flash SIMM found, Flash file system is not available. Doesn't sound good. Also, when I do the command show flash, I get %Error parsing flash: (No such device) and when I do dir flash I get the same thing.
Is this something I can correct from the config of another of my routers, or is it some kind of hardware problem? I can't eliminate the possibility that it may be a humidity-related issue, since it has been boxed in my garage for some time.
Is this something I can correct from the config of another of my routers, or is it some kind of hardware problem? I can't eliminate the possibility that it may be a humidity-related issue, since it has been boxed in my garage for some time.
Comments
Step two would be to get new flash and retest.
End-of-Sale Announcement for MC3810 Platforms and Select Modules - Cisco
Looks like it's probably not worth the time/$ to get a new flash for it, I would at least open it up and see if you can re-seat the SIMM/DIMM module.
Cisco MC3810 Series 8MB Flash Upgrade, MEM-381-1X8F