Samsung P5100

[Sedy]

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38, JTAG Manager Version: 1.57

Connecting to the SD/eMMC Card...OK
Set I/O Voltage reads as 3.31V, SD_CLK Frequency is 637.5 KHz

Memory Type .......................... eMMC
Manufacturer ID ...................... 0x15
OEM/Application ID ................... 0x00
Product Name ......................... "MAG2GA"
Package .............................. BGA
User Area Parition Size .............. 0x0003AB400000 Bytes (14.68 GB)
Boot Partition Size .................. 0x000000200000 Bytes (2.00 MB)
RPMB Partition Size .................. 0x000000020000 Bytes (128.00 KB)
OCR Register ......................... 0xC0FF8080 (Dual Voltage, High Capacity)
Write Protection Bits ................ NONE
Boot Configuration ................... No Boot
Chip Revision ........................ 1.15
Multimedia Card Revision ............. 1.5 (eMMC v4.41)
Serial Number ........................ 0xB05743C3
Memory Manufacturing Date ............ July, 2013

read failed

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38, JTAG Manager Version: 1.57

Connecting to the SD/eMMC Card...OK
Set I/O Voltage reads as 3.31V, SD_CLK Frequency is 637.5 KHz

Detected eMMC Chip, ID: 0x15/0x00 (MAG2GA), User Area Partition = 0x0003AB400000 Bytes (14.68 GB)

Reading "User Area Partition" address space from 0x000000000000 to 0x0003AB3FFFFF
Failed to receive answer to READ command.

[aleksa94]

Check wires and also try to change SD_CLK Frequency.

[Albun]

Try reading just 0x0200 bytes length

[Sedy]

Try reading just 0x0200 bytes length

Good read 0x0200

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38.1b, JTAG Manager Version: 1.57 [BETA 2]

Connecting to the SD/eMMC Card...OK
Set I/O Voltage reads as 3.31V, SD_CLK Frequency is 727 KHz

Detected eMMC Chip, ID: 0x15/0x00 (MAG2GA), User Area Partition = 0x0003AB400000 Bytes (14.68 GB)

Reading "User Area Partition" address space from 0x000000000000 to 0x0000000001FF
Completed in 00:00:00.031 (Average Transfer Rate: 16.13 kB/s)

Not Read 0x0400

Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.38.1b, JTAG Manager Version: 1.57 [BETA 2]

Connecting to the SD/eMMC Card...OK
Set I/O Voltage reads as 3.31V, SD_CLK Frequency is 727 KHz

Detected eMMC Chip, ID: 0x15/0x00 (MAG2GA), User Area Partition = 0x0003AB400000 Bytes (14.68 GB)

Reading "User Area Partition" address space from 0x000000000000 to 0x0000000003FF
Failed to receive answer to READ command.

[Legija]

This is controller fault (internal one in eMMC). It used to happen exactly like this in some of the HTC models.
Put it asside, maybe later there will be some way of reflashing it.

[Sedy]

This is controller fault (internal one in eMMC). It used to happen exactly like this in some of the HTC models.
Put it asside, maybe later there will be some way of reflashing it.

Strange, but I fully working board

[Legija]

Strange, but I fully working board

No, i think such phones freeze at some point.
Or, this can be caused by bad clock, or watchdog. Reason why You can read 0x200 and not any greater chunk is that internal controller shuts down the power.
Can be due to "some" fault in internal circuitry, or clock fault.

[Albun]

...Good read 0x0200
...Not Read 0x0400

Please, if you still have got this device, try reading (>0x200) again with 1.38.3b firmware.