BIOS have lock VID/PID.
1. Ericsson F3607gw: 0BDB_1905, 0BDB_1907
2. Huawei EM770/770U/770W: 12D1_1003, 12D1_1001, 12D1_1404
3. Qualcomm GOBI: 05C6_9204, 05C6_9205
4. Huawei EM660: 12D1_1001 12D1_1404
then by understanding the guide here and using the hs2300 info from here, I was able to replace one of the Huawei's VID/PID (12D1_1003) with HS 2300's VID/PID (03F0_1E1D).
I didn't mess with the SUBSYS anymore. Be aware though that the IDs are grouped and mirrored in hexadecimal so you should look for D112 0310 and replace it with F003 1D1E
Be very careful though since incorrect editing might result in catastrophic situation (frying your BIOS). What I've posted is just a guide on what I did and doesn't guarantee that it will work the same on your unit. As I said in my OP, I took a gamble and fortunately it paid off.









