samsung s5 stays on samsung logo - Galaxy S 5 Q&A, Help & Troubleshooting

hello everyone, i have a problem with my s5, after custom romming it it wont boot to the stock because it stays on the samsung flickering logo, any idea on why? its using a cheap battery

I'm experiencing the same issue on my not rooted G900F (Italy) and I'm stuck, waiting for any advice.
Not sure if it was due to a custom firmware though, since I stopped using it many years ago...
I also tried hard reset and any wipe options available.
Thanks in advance.

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I have flashed all my phones till now, but now im scared to flash the S4, because of this problem.
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Hello, i currently own a samsung galaxy s3. so i know alot already about installing custom rom, custom recovery kernels etc..
i once bought a samsung galaxy s5 and customized it successfully but there are times that the phone reboots randomly for no reason. and that was a hardware issue i suppose, since after i flashed and original firmware, the reboot problem hasn't gone
any heads up i need to know before i install any custom rom or so? i am planning to buy an s5 but scared to make mistakes again.
are there any apps to test the hardware issues?
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Samsung Galaxy S8 Plus Firmware

Ive got a galaxy s8 plus which has the three logo coming up when powered on. I'm not interested in rooting it or installing a custom rom but I would like to get rid of the three logo and bloatware by flashing it with a generic rom. I do not want to trip the knox counter either. Ive flashed older samsungs but what do i need? Thanks in advance guys

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