`rebranded_api` and `updateOperations()` which were introduced before hf24 are now deprecated. You can remove both from your code safely. Also, one API call is removed which was used before hf24 to update the `chain_id` on broadcasting every transaction.

It's highly recommended to update.

rebranded_api and updateOperations() which were introduced before hf24 are now deprecated. You can remove both from your code safely. Also, one API call is removed which was used before hf24 to update the chain_id on broadcasting every transaction.