Hello, I am looking for TS-253Be Bios file.
There is a download link but ‘access denied’ once I clicked.
Please help.
If you have a specific issue this BIOS would fix, open a ticket with QNAP support to get the file.
Got it. Thank you 
Regarding how to update the BIOS, you can refer to this video: How to update the BIOS of a QNAP NAS / 如何更新 QNAP NAS 的 BIOS
The file can be found in our download center: Download Center
However, if you have any questions or need assistance during this process, please open a support ticket for us, and our customer service team can provide further help. Thanks!
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Thank you for the detail information. I have found Bios and installed it! Thank you.