Get new the pack of firmware for ip phone

Hi all.
I’m stuck at how to get newest the pack of firmware that i want to upgrade for ipphone.
I’m using freepbx, ipphone: grandstream 1615, my firmware pack: 1.18,
it included firmware version GXP-1610 for Grandstream 1615.
I tried with some document but seem like they did not help.
So guys, could you pls help me?
Thank you!

What did you try?

I flowed this one.

See installing custom firmware.

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