Who cares, the problem was solved using the bitrix technical support pretty quickly.
If in the address bar in the admin panel to enter the following:
because of the setting BX_SUPPORT_MODE=Y will turn on the special menu, which in normal mode is not shown.
After just needed to reload the files in the main module.
The restart files can be quite a long time and eventually shows error 502, but nevertheless, the script continues to work on and after some time the admin panel is rendered again with a debug module. Such a reset of the module is obtained.