Uniswap Universal Router
error InsufficientETH()A transaction that reverts with the raw data 0x6a12f104 hit the custom error InsufficientETH, defined in Uniswap Universal Router. The explorer shows the hex because it does not have the contract's ABI to translate it.
The router needed more native ETH than the transaction supplied, common when a route wraps ETH mid-path and the value attached does not cover it.
Rebuild from the dapp with a fresh quote rather than editing the transaction value by hand.
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Every selector on this page was computed as the first 4 bytes of keccak256 of the signature shown. A selector identifies a signature exactly; on rare occasions two different signatures share one, so the transaction decoder is always the more precise answer.