yes wallet broken if no previous blocks
upgrade is fine because blocks are already present
dev not fix because regards darren palmer only care about bittrex wallet for pump dump
now days with no fix

also blocks meant to be at 5 minutes
really big pools make high difficulty and disappear
leave high diff and no miners
this just like mazacoin problem

coin will die if no new dev that work for PRO

100 sats
1 sat
1000 sats
doesn't matter if you only trade coins it will die
make a better coin and stop twitter pump