If that's of any help, here is the URL called by the Bose [USB Link Firmware Updater application](https://pro.bose.com/en_us/products/conferencing/headphones/noise-cancelling-headphones-700-conferencing.html#ProductTabs_tab2) : https://assets.bose.com/content/dam/Bose_DAM/Web/pro/software/bose_work/700uc/1_0_0/fileInfo.json
If that's of any help, here is the URL called by the Bose USB Link Firmware Updater application : https://assets.bose.com/content/dam/Bose_DAM/Web/pro/software/bose_work/700uc/1_0_0/fileInfo.json