Do you recall it said "GIR Version Mismatch" ?? if yes it means that rgn file you got has a wrong fw1_resources.bin for US unit.
If you like to downgrade to US 3.00 ( Be sure your 1490 is US unit and your current firmware contain US hwid in boot.bin, You can check it out with inventory page and see what hwid of boot section ) , The other way is
- Get original US swv 3.00 gupdate.gcd and downgrade as normal and it should work.
Did you check your RGN file with RGN_Tool ? And what swv for fw_all.bin part (300 or 490 ? ) ?



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