How to open phone stuck in download mode?

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Android Central Question

It's a Samsung Galaxy C9 pro it was lagging and than just showed a black screen when I tried to switch it on it got stuck it shows
"Could not do normal boot
ddi : mmc_read failed
ODIN MODE (HIGH SPEED)
PRODUCT NAME: SM-C900F
CURRENT BINARY: Samsung Official
SYSTEM STATUS: Custom
FRP LOCK: OFF
DID : 29906bb2dfd0
WARRANTY VOID: 0X0
QUALCOMM SECUREBOOT: ENABLE (CSB)
RP SWREV: S1, T1, R1, A1, P1
SECURE DOWNLOAD : ENABLE
ERROR: Cannot read boot image header
Can't get fdt
downloade mode !!"
Please help how can I solve this...!!!!?????😩
 

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Laura Knotek

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Welcome to Android Central! Unfortunately, that sounds like hardware failure (mmc is the memory chip). It's a five year old phone, so it wouldn't be too surprising for this to happen.

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I'm thinking the same, since "WARRANTY VOID: 0X0" means the device isn't rooted.