You can easily download the Proton C28 Stock Firmware from the below link. This firmware comes in a zip package. Just download and extract on your PC/Laptop. Now contact us for unlock key and follow our next instructions. After we will be sent to the key with your contacting number by massage.
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Source
- File Name: Proton C28
- Chipset: 6531E
- File Size: 4MB
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Source