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Blackberry 9900 only red light battery solution if u have this blackberry model put in set battary but set not on only red light and again off your phone i have manual and final solution this problem see my solution and try step by step

1st try this full set firmware update i hope solved your phone blackberry red light solution but not solve see 2nd try this solution

Blackberry 9900 cellular phone mic repair solution

see this diagram and try my solution step by step i think solved your phone 100% see red mark all guide and try to 1st and 2nd step 100% working this solution tested many time me this solution and dont forget visit my blog .