2022/09/08
1. Firmware: I-7590_131.fw
2. Hardware: I-7590 Rev1.90
3. Fix problem: After the EEPROM component is changed, there is a problem with EEPROM read/write.

2019/03/05
1. Firmware: I-7590_130.fw
2. Hardware: I-7590 Rev1.90
3. Fix problem: Solved the compatibility problem with meter communication.

2017/07/07
1. Firmware: I-7590_120.fw
2. Hardware: I-7590 Rev1.33