[addae]

I bought a feature phone which was manufactured like TECNO t528 and had the features like original TECNO t528 phone. This phone developed a problem of invalid charger and after correcting the problem and had to reset this RDA chipset type of TECNO t528 and after resetting the phone the TECNO logo and TECNO welcoming tone all formated.please help me.

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[xerxes]

I bought a feature  phone which was manufactured like TECNO t528 and had the features like original TECNO t528 phone. This phone developed a problem of invalid charger and after correcting the problem and had to reset this RDA chipset type of TECNO t528 and after resetting the  phone the TECNO logo and TECNO welcoming tone all formated.please help me.

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you'll need to check and confirm this is not a hardware issue. 
How did you fix the 'invalid charger issue'? (Maybe you've damaged/disconnected the speakers.)

[EMMANUS]

How did you confirm it is RDA chipset?
Make a backup of the current firmware and try flashing with TECNO t528 rom. (very risky)

[addae]

How did you confirm it is RDA chipset?
Make a backup of the current firmware and try flashing with TECNO t528 rom. (very risky)

It gave me invalid charger problem that made me to know after changing the charging ic.

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[X3non]

It gave me invalid charger problem that made me to know after changing the charging ic.

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tecno 528 uses mtk mt6260 chipset, if you're sure yours is rda chipset then yours is likely a clone