Bedrock currently supports Etherum mainnet unstaking uniBTC
Mantle, OP, Corn, and Arbitrum's uniBTC can be unstaking by bridging uniBTC to the main network through Bridge
Unpledge
Picture taken from Bedrock DAPP
The upper limit for unstaking is only 0.5 WBTC
After unstaking, you need to wait for an eight-day cooling period before you can withdraw it.
There is a 0.5% handling fee for withdrawals
Bridge mode
Picture taken from Bedrock DAPP
Currently, the three chains of ETH, ARB, and BSC can communicate with each other, but OP, Corn, and Mantle can only be bridged to ETH.
Except for the OP whose CAP is less than 1 uniBTC, all other chains have 2 uniBTC CAPs that can be used.
Be aware of the bridging fees, they are not cheap.