ICX Token swap schedule announcement
https://medium.com/helloiconworld/icx-token-swap-schedule-announcement-10238888a50d

The ERC20 ICX tokens will be swapped to mainnet ICX coins with a 1:1 swap exchange rate (1 ERC20 ICX token = 1 mainnet ICX coin). Please be aware that once the token swap is made, you cannot convert them back to ERC20 ICX tokens.

Token Swap schedule
1. ICONex: 2018.06.25(13:00,UTC+9) ~ 2018.09.25(13:00,UTC+9)
2. Exchanges: Deposit your ERC20 ICX tokens to the exchange until;
- Binance: 2018.6.20 (09:00,UTC+9)
- Upbit: 2018.6.20 (22:00,UTC+9)
- Bithumb: 2018.6.21 (Time to be announced)
 (Official announcement from Bithumb will be announced soon)