Format Phison Ps2251-68(Ps2268 Encrypted3/27/2021
VlaDisKaS, ChiGenius 21.11.19, 19:17 954 peligroso 4PDA: ( 924 ) VlaDisKaS, 22.11.19, 15:11 955 VlaDisKaS 4PDA: ( 12 ) rusigor 21.11.19, 19:03 ChiGenius Description: F: USB(JetFlash Transcend 32GB) Device Type: Mass Storage Device Protocal Version: USB 3.20 Current Speed: Super Speed Max Current: 304mA USB Device ID: VID 8564 PID 1000 Serial Number: 07D0ZY5ZQF8ZANGM Device Vendor: JetFlash Device Name: Mass Storage Device Device Revision: 1100 Manufacturer: JetFlash Product Model: Transcend 32GB Product Revision: 1100 Controller Vendor: SMI Controller Part-Number: SM3269AB - ISP 180705-0AB Flash ID code: 2CA40832 - Micron - 1CESingle Channel TLC - Total Capacity 32GB JetFlash,,,.VlaDisKaS 22.11.19, 15:11 Controller Part-Number: SM3269AB - ISP 180705-0AB SM3269AB - 20329-v3-firmware.html -,,.
VlaDisKaS 4PDA: ( 12 ) rusigor 22.11.19, 20:43,, 5-6,., SM3269 AA, SM3269 AB.. VlaDisKaS 23.11.19, 22:01.,. VlaDisKaS 4PDA: ( 12 ) rusigor 23.11.19, 22:39,. SM326 8 AB (ChiGenius ),, - OnLineRecovery.,.,. VlaDisKaS - 24.11.19, 11:28 25.11.19, 12:01 960 vasecd3 4PDA: ( 13 ) Sandisk usb 3.0 ultra 128. Windows,..,,..,., USB 3,.,., Windows,., -..,.,.,., - 25.11.19, 21:22 961 rusigor: ( 1709 ) vasecd3 25.11.19, 12:01,.: ChipGenius ( - ) 70 46 47 48 49 50 51: 18.03.21, 06:01 4PDA 2005-2021.. PDA -. IP.Board 2021 IPS, Inc. After finding Jeremys post, I wrote him an email (not really expecting a reply) but Jeremy ended up becoming an incredible help. The following post details the journey to getting the device working again. It also shows the power of reaching out to more experienced experts. You never know wherewhen you might find that missing piece of the puzzle Special Thankyous to the following monkey-enablers for their assistanceadviceenduring my endless emails: - Sasha Sheremetov from Rusolut - Jeremy Brock from RecoverMyFlashDrive - Maggie Gaffney from Teel Technologies USA - Cory Stenzel ( Twitter - Cory also encouraged me to write this post) - Ryan Olson We started with a non-functioning 16 GB USB flash drive with no case or obvious branding. The original USB connector had broken off and was replaced with a different one provided by the repairer. The drive looked similar to this example posted by atomcrusher on Reddit. We did not plug it into a PC initially because we did not know what data was stored on the device (e.g. USB Rubber Ducky ). We later used an older sacrificial standalone PC during subsequent testing. The USB drive only used 4 pads for the connector (GND, 5V, D, D-) so it was probably USB2. The electroschematics.com website has a good introduction to USB devices here. There appeared to be a missing component near the activity LED. There was a Phison PS2251-68-5 NAND controller on one side of the circuit board and a Toshiba 16 GB Embedded MultiMediaCard (e.MMC) chip on the other side. For older USB flash drives, the NAND controller is usually a squared shaped chip (e.g. LQFP48 Low Profile Quad Flat Pack with 48 pins) similar to the one shown in the Reddit example pic. The controller chip is responsible for translating the host devices (ie PCs) USB readwrite instructions into commands that the memory chip can understand. The controller also looks after wear levelling of memory and determines how each write is stored (physical locationany error correctiondata deletion). The presence of an e.MMC memory chip was somewhat unexpected. Older USB flash drives typically use a single NAND controller chip and separate NAND memory chips (usually TSOP48 chips where TSOP48 Thin Small Outline Package with 48 pins.). Heres an example diagram of a TSOP48 package from the Elnec chip reader website. An e.MMC chip is different because it combines its own onboard memory controller with some NAND memory. The e.MMC chip package is usually BGA ( BGA Ball Grid Array). A quick Google of the Toshiba part number written on the BGA confirmed that it was a 16 GB e.MMC chip. Hmmm. e.MMC chips are usually more expensive than regular NAND memory. Why would a USB flash drive manufacturer use e.MMC chips when theres already a dedicated Phison NAND controller chip on the board Sasha from Rusolut mentioned this possibility during his very informative Visual NAND Reconstructor course. Typically, e.MMC chips used in this type of arrangement are discounted factory seconds - they have a faultydisabled internal controller but the NAND memory is OK so theyre sold as cheaper NAND chips. Interestingly, Rusolut also have a solution to read e.MMC chips via NAND interface points (ie it accesses the NAND memory directly and avoids talking to the internal controller). Unfortunately, I dont have access to that wonderful tool and NAND reconstruction into a filesystem can be very complicated and heavily device dependent. For example, two flash drives which use the same controller but run different firmwares can organize the NAND in different ways. Normal functioning e.MMC chips can also be removed and read via adapters (e.g. USB-eMMC adapters) that talk to the internal e.MMC controller. However, because our devices e.MMC probably has a faultydisabled on-board controller, such a read would not be accuratereliable. So our initial strategy was to try to repair the flash drive, get it recognized by a PC and then image it via FTK Imager. We started by gathering as much information about the repair drive as possible. We Googled for any datasheets for: - the Phison controller model - the Toshiba memory chip model We didnt have a lot of success finding datasheets however, we also noticed there was a serial number (POVK568FS1400311) printed on the PCB. Googling for the serial number led us to this post by Jeremy from RecoverMyFlashDrive. From the posts pictures, we could see the same circuit design layout, the same component labels and the same controller chip as the repair job but a different e.MMC chip (still a Toshiba e.MMC though). To better conceptualize the layout, I recommend you check out the board pictures via the RecoverMyFlashDrive link above and have them open in a separate tab to follow along.
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