South S660p firmware update

Hello, I need help. After the firmware s660p 1.09.220916.RG60GL, after the receiver has dialed satellites, if you turn it off, the LEDs blink for about 1-2 minutes, and only after that it turns off. If the satellites are not dialed, for example, indoors, then it turns off normally - three blinks of the LEDs and turns off. It is impossible to update to the previous firmware 1.09.220415.RG60GL.img, it remains the same.
And after turning on the receiver, and the set of satellites on the SurvCe screen shows hrms 0.000, vrms 0.000, hdop 0.000 and the number of satellites is normal. Shows such about a minute, normal values.