Don't disable flash DIO operation before flashing - it works fine with DIO

rtlplayground.c

@@ -1884,7 +1884,6 @@ void check_and_flash_update_image(void)
 		__xdata uint16_t j = 0;
 		__xdata uint8_t * __xdata bptr;
 		print_string("found update image!\nChecking integrity");
-		flash_init(0); // Re-initialize flash for non-DIO operation, otherwise flashing will fail
 		set_sys_led_state(SYS_LED_FAST);
 		crc_value = 0x0000;
 		for (i = 0; i < 1024; i++) {