[WORKAROUND] Unable to create string as not enough memory (FlashEEPROM problem)

It turns out that I had corrupted FlashEEPROM's 0x076000+1024 area with so many writes. When I get the object with new require("FlashEEPROM")(0x077000), I can use this FlashEEPROM area.

Now I changed the app code to use RAM, and flush very very rarely to the FlashEEPROM.