Huawei B311221: Firmware Portable

Standard firmware expects constant AC power. Portable firmware versions (often derived from Mifi or travel router code) allow the device to run efficiently off a 12V battery pack, a power bank (via USB-to-12V cables), or a vehicle's cigarette lighter. It reduces LED brightness and disables non-essential background scanning.

The Huawei B311-221 Go to product viewer dialog for this item. huawei b311221 firmware portable

Consider what features you're looking for. Sometimes, what you want might already be available in the latest official firmware. Standard firmware expects constant AC power