TRON network has released the Odyssey 3.6.6 on Jan 13, 2020 (SGT).
The main updates in this version are:
1)Optimized the HTTP interface for SRs to modify the commission rate;
2)Extended the allowed instruction sets for off-chain smart contract call;
3)Added a proposal to forbid using TransferContract & TransferAssetContract for contract account.
This is a forced upgrade. All nodes are expected to complete the upgrade as soon as possible.