i'm seein bad blocks appearing in my rb435g every time i try to upgrade/downgrade ros version....
it only 17 blocks so far but...... should i start to be worried?

anything below 100 bad blocks is completely normal.

i'm seein bad blocks appearing in my rb435g every time i try to upgrade/downgrade ros version....
it only 17 blocks so far but...... should i start to be worried?

Did you install microsd card into this routerboard ? If yes try to remove it and check behavior. I've found on my 493G once I've installed microsd card quantity of bad blocks increase during write operations to main nand.