我们已完成本地所有打印机的固件升级.
正确的翻译应该是：
We have completed the upgrading of firmwares for/of all local printers.
Firmwares of all local printers have been upgraded by us.
【英语牛人团】倾情奉献,
我们已完成本地所有打印机的固件升级.
正确的翻译应该是：
We have completed the upgrading of firmwares for/of all local printers.
Firmwares of all local printers have been upgraded by us.
【英语牛人团】倾情奉献,