Speaking of 2 - S19 (with original Firmware from April 2021)
I followed the steps in the Firmware Download section at the Bitmain site, first Downloaded the PRE Firmware (17mb)
After upgrading the 17mb (pre) firmware, the date is not correct (I though it should be December 28 not November 21)
Both S19 shows the same Firmware Date
Tried 3 times to upload the Merged Firmware (148mb) for low power mode with no success it does not update.
It does not change the date Nov 21 as the firmware, neither appears the "Low Power" mode in the settings.
I already cleaned the cookies of the browser with same results.
Any help, would be great! Thanks