Loaders use CPU SRAM only so it's possible to boot even semi-dead devices with damaged hardware. Original factory DA/loaders CAN NOT DO THIS!
EMMC health status: Once you boot in [FF] mode you will see deep info about EMMC flash chip health
RAM health status: If you can not boot device with factory loaders but [FF] can works well it may says that RAM is Faulty
At first check EMMC date.
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EMMC CID: F40122426977696E201000..... crc Ok
Vendor: Biwin OEM: 0x0122 ID: 426977696E20 [Biwin ] PRV: 0x10 Serial: .... 0x0003D4ED
MM/YY: 11/2020
BOOT1: 0x00400000 4,00 Mb
BOOT2: 0x00400000 4,00 Mb
RPMB: 0x00400000 4,00 Mb
USER: 0x748000000 29,13 Gb
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EOL: Status: Normal: Less than 80% reserved blocks used
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EOL_A: SLC status: 0% - 10% used
EOL_B: MLC status: 30% - 40% used