Индикаторы Huawei Hg850a

Hello,

I've an old GPON ONT Router from Huawei, the HG It was provided by an ISP that no longer exists, and I would like to use it in another ISP (because it provides more ethernet ports and voip). I'm aware the process can be hard, however I've a friend on the other ISP that can me help me with the configuration down the line.

Here is the problem: none of us is able to use the telnet login of the HG to reconfigure it. We believe the old ISP changed the default login data:

(The preset user name of the terminal is root and the password is admin.)

Here is a link to the manual: eunic-brussels.eu

Since there are a lot of hardware experts in this forum I would be really grateful if someone can provide us with a way to reset the device to default settings or hack the login somehow. My first thought was to check for a reset button or a JTAG / serial interface, however there isn't anything visible / properly marked on the device. Here are some pictures of the board (can take more):

On the last picture J2 looks like part of a JTAG / UART port. Does someone have some knowledge about this ONT? Is there a way I can reset it to default settings?

Many thanks in advance!

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