f(x)Core mainnet upgrade V2.1.0 was aborted due to unexpected contradictions with working-on updates. V2.1.1 was released to continue the fxv2 upgrade proposed to take place at height 5,713,000.
Validators on f(x)Core Mainnet need to abort the upgrade V2.1.0 and use V2.1.1 for the fxv2 upgrade