The most reliable source for the hardware revision is the Eastern European/Russian support repository, which lists multiple versions for the (A3 equivalent):
If the "ET" (Etisalat or other regional) stock firmware is locked or outdated, many users switch to for better performance: OpenWrt for DIR-853 A3 : Stable versions like 23.05.3 are available on the OpenWrt Firmware Selector
These video guides provide step-by-step visual instructions for updating your DIR-853 firmware or switching to OpenWrt:
Never update firmware over Wi-Fi. A signal drop during the flash will ruin the router.
Always use a between your computer and the router when updating. Do not use Wi-Fi, as a dropped connection during the process can cause a system failure. How do I update my device's firmware manually? | D-Link
The most reliable source for the hardware revision is the Eastern European/Russian support repository, which lists multiple versions for the (A3 equivalent):
If the "ET" (Etisalat or other regional) stock firmware is locked or outdated, many users switch to for better performance: OpenWrt for DIR-853 A3 : Stable versions like 23.05.3 are available on the OpenWrt Firmware Selector
These video guides provide step-by-step visual instructions for updating your DIR-853 firmware or switching to OpenWrt:
Never update firmware over Wi-Fi. A signal drop during the flash will ruin the router.
Always use a between your computer and the router when updating. Do not use Wi-Fi, as a dropped connection during the process can cause a system failure. How do I update my device's firmware manually? | D-Link