Resolved! STM32G491CC (not defined FLASH_OPTR_DBANK) -> Problem cube firmware (stm32g4xx_hal_flash.h) , FLASH_PAGE_NB is wrong
FLASH_PAGE_NB is wrong == 64 page, must be 128 pages #define FLASH_PAGE_NB ((FLASH_SIZE == 0x00080000U) ? 256U : 64U)Work for STM32G491CE == 256 Pages