@ThomasY 

From here:

https://www.tp-link.com/us/support/download/tl-sg108e/v6/#Firmware

  @Somnus The link has same version I downloaded, which is 2020xxxx. I'm looking for at least 2021xxx (which is the factory installed version). 

Seems to-link didn't put the latest version on their website.

  @ThomasY 

Make sure you are on the tp-link US website. Sometimes the web browser will guide you to your region website, but we can force to US website manually by editing the URL

Thanks  @Somnus and @Shoresy , it works.

Sorry for the last response.

  @ThomasY 

Thank you for sharing your experience with upgrading the firmware for the SG-108E switch. It's always important to make sure that the firmware is up-to-date for optimal performance and security. I'm sorry to hear that you accidentally downgraded your switch instead of upgrading it. It's easy to overlook the firmware version number and download the wrong one. However, it's good to hear that the process was successful and the switch is still functioning properly. Regarding your question about the Latest firmware, I did some research and found that the latest firmware for the SG-108E switch is 20220112 Rel.64241, which was released on January 12, 2022. You can download it from the TP-Link Canada website or through the switch's web interface. I hope this information helps and that you're able to successfully upgrade to the latest firmware version. It's always a good idea to stay on top of the latest updates to ensure the best performance and security for your devices.

To get the latest firmware for SG-108E, you can check the manufacturer's website or contact their customer support team.