Thanks, but I'm currently using an LPC55S69 processor. It is better than any of the STM32L series.   

Hello,Here is what the support service answered:

Dear Sir/Madam,Case #:00069248, Subject:STM32CubeProgrammer has been updated by ST Support.Hello Nikolay,thank you for raising this issue. I could reproduce it.This issue was already raised internally to CubeProgrammer development team.To solve this ...

I found that by using the STM32CubeProg it is impossible to erase some sectors of STM32L475RG: 254, 253, 252 and so on. 

(Sorry for my english)In STM32L4 I use USB OTG as device. It is much more convenient than using USB FS in STM32F103. Maybe it was just worth removing the host function, leaving the device as in STML4?