After flashing the device with a new firmware, it became 1832C again, I had to apply the Teixeluis method, everything worked out great.
But the device did not remember the calibration after turning off, I decided to try to enter the device into debug mode, while the red inscription "DEBUG" lights up on the device screen next to the battery, disconnected the device from the computer, the inscription remained, did the calibration open and closed, connected 1833C to computer, wrote the command "fact: save" and exited debug mode. Now, when you turn on the power, the device loads the calibration that I did.
Good luck!