This I answer myself huawei on the kernel source (G620s).
Thank you for contacting Huawei device.
The open source is under our technical department to make.
Since the procedure is a little more complex, so please kindly be a little patient.
Please keep cheking the weblink below for more update:
Once again thank you for contacting Huawei device.
Stock recovery.img and boot.img of G620s https://mega.co.nz/#!3tYGwSqS!7KGQIMpTkw3yP2gGIkw8JkAp1p3EI1GzvH4-zw3oDLU