: Original or poorly patched loaders can erase unique device data, including the IMEI and calibration settings, stored in NVRAM.

The installation package will detect the open port and apply the new firmware version smoothly without throwing an Error 19 block. Crucial Post-Flash Step: Repairing Damaged NVRAM/IMEI

This article is for educational purposes only. The author and platform are not responsible for any damage to your hardware.

: Ensure you use the usbloader.bin specifically intended for the E5573s series , as using one for a different model (like the E5573cs) can permanently brick the device.

Modifying firmware and using USB loader binaries can void your warranty and damage your device permanently. Proceed at your own risk.

When you try to unlock or debrand a Huawei E5573s-320, you must put the modem into (sometimes called "download mode"). This allows software on your computer to push a new firmware or usbloader.bin file to the modem's memory. "Usbloaderbin hot" generally refers to a situation where:

You bought a cheap E5573s-320 locked to a specific carrier (e.g., EE, Smart, Telcel). Generic unlocking codes cost money. Using the USBLoaDerBin with a modified UPDATE.APP allows you to flash an unbranded "Unicom" firmware, removing the SIM lock completely.

Short changelog

Locate the , which is a tiny gold copper pad situated near the SIM card slot or under the shielding canopy.

Locate the , which is a tiny gold copper pad situated near the micro-USB port structure.