A client of mine sent me BTC today with a very low fee - only 5 sat/byte ( apparently the default Blockchain.info fee at the moment of sending ).

I checked out bitcoinfees.21.co and the delay should have been not more than 300 minutes ( that was listed at the time ). However, it's been 11 hours so far, and not a single confirmation yet.

I tried accelerating the transaction on ViaBTC but when I enter the TX ID, I get an error saying "Transaction fee too low"...

Is anyone able to help?

The transaction ID is 2305d4415d0377a59697cd7bddb560a341c68a9705177056ae60bb3ddaa5e002