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Go Back   GSM-Forum > Product Support Sections > Hard/Software Products (official support) > Infinity-Box

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Old 01-07-2023, 19:26   #1 (permalink)
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Help firmware downgrade Blu J9L SPD


Hello
I need help.
How can I flash a Blu J9L J0090ww with a previous version and it doesn't die?
I have this: BLU_J9L_V11.0.G.04.06_GENERIC
Your phone has this: BLU_J9L_V11.0.G.04.12_GENERIC

Thanks
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Old 01-22-2023, 19:12   #2 (permalink)
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Hi,
Why do you think phone become damaged after downgrade?
Do you have any experience with this model?
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Old 01-25-2023, 21:56   #3 (permalink)
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Hello
I didn't do the job.
I know that if I downgrade the version the phone dies.
I didn't explain it correctly, I should have asked:
Is there a possibility to unlock the bootloader?
I have no experience with this model, it is not common in my country.
I can't find a way to unlock the bootloader
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Old 01-26-2023, 03:02   #4 (permalink)
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You can try mate, then give us the feedback, it is known that downgrading phone FW is risky it can end up dead. Its up to you if youre taking the risk.


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Old 01-26-2023, 03:03   #5 (permalink)
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You can try mate, then give us the feedback, it is known that downgrading phone FW is risky it can end up dead. Its up to you if youre taking the risk.


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