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Hello, 

where can I download TRB1450_R_00.01.05 ?

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Hello,

The version that you are looking for is very outdated and is no longer available to download. Why do you want to install this firmware?

Regards.
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There are two devices. Both have RS485 configured. In a device with firmware TRB1450_R_00.01.05, the transmission is working properly. RS485 does not work in a device with TRB1450_R_00.02.04.3 firmware.

What could be the problem ?

Tried updating TRB1450_R_00.02.04.3 to the latest version. It ended unsuccessfully. The device stopped responding through the web-interface.

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Could you try to upgrade your router firmware gradually? First, download 2.5.1 version, then upgrade to 2.6 and 7.0. You can download firmware files from there: https://wiki.teltonika-networks.com/view/TRB145_Firmware_Downloads

Regards.

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Does the RS485 only need settings like in the picture? Or are there any more?