OTA Ikea devices

I’m running zigbee2mqtt in home assistant and i’m running home assistant on proxmox.

I can’t update my Ikea switches. I understand that the workaround is to change the download url in the tradfi.js file. As suggested here I cant find this file anywhere on home assistant or my proxmox machine.

Does anybody knows where I can find this file?

You should find this file on the machine where zigbee2mqtt is installed.
As the root user with:

find / -name 'tradfri.js'

or as a normal user (that has sudo rights) with:

sudo find / -name 'tradfri.js'