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#A500 APX DRIVER DOWNLOAD SERIAL#
#A500 APX DRIVER DOWNLOAD PATCH#

Nv3p - Used after miniloader is uploaded to actually do stuff.

RCM - Used initially to get rcm version, upload miniloader, get some other device information.

Could perhaps be a fun project to dump using wireshark and try to create an open alternative to nvflash. nvflash -r -getpartitiontable partition.txt nvflash -bl bootloader.bin -getbct -bct backup.bct -go The bootloader can also be extracted from the dump

Wait 1 second, release the reset button.

sync sync sync echo 5 > /sys/EcControl/RecoveryMode.

There are a few different ways to get the A500 into APX mode. APX ModeĪPX mode is the NVIDIA Tegra recovery mode, when in APX mode the device will identify as a NVIDIA device 0955:7820. A small tool to decrypt (libgcrypt based) can be found here. The SBK is used to encrypt BCT and EBT AES128 CBC.

If using a little-endian architecture, swap the byte orderĪ C implementation of the algorithm for generating the key can be found here.

For each part, take the ascii values and multiply with 100 raised to the position.

Split the UID into four 4 character strings.

To generate the SBK from the UID (assumign UID is a hexadecimal string) Generating the SBKįor clarification, as there seem to be some confusion, this describes a vendor/model specific algorithm that is used by a few Acer models. The device will respond with the UID to the first read after it have been started in APX. Hal-get-property -udi "$(hal-find-by-property -key 'info.product' -string 'Iconia tablet A500')" -key 'usb_rial'

#A500 APX DRIVER DOWNLOAD SERIAL#

The UID is also the USB serial numer of the device. The SBK used for the Iconia A500 is generated based on the UID of the device and thus unique for each device. Secure Boot Key (SBK)Ī description of what Secure Boot Key (SBK) is can be found at. When in APX mode the device can be flashed using NVIDIA's nvflash. To trigger a rebuild of the checksums on boot replace 64 bytes at offset 0x84 with "00 FB 30 94 99 01 4F 97 2E 4C 2B A5 18 6B DD 06" x 4. Seems to contain Widevine DRM key storage? The boot partitons LNX and SOS contain combined kernel and initrd images, following the format described in bootimg.h AKBĬhecksums for the rest of the partitions, and what more? checking checksums, signing? Boot Partitons (LNX and SOS) The bitfield values for ODM Data is specified in tegra_devkit_custopt.h. ODM Data is a 32bit value that can be found at offset 0xfe4 in the BCT. File layout OffsetĬhecksum - AES-CMAC of the rest of the fileīlock size in log2 (14 => 2**14 = 0x4000) There is a bct_dump tool available trough the chromium project, the source can be found in the cbootimage repository. The Boot Config Table (BCT) contain quite a bit of information. mnt/sdcard is fuse mounted from /data/media.īCT and EBT are encrypted using the SBK.

#A500 APX DRIVER DOWNLOAD PATCH#

It have however been reverse engineered based on the Toshiba AC100/Dynabook AZ: Patch nvtegra.c and here. The parition layout is in a NVIDIA proprietary format with no public official specification. Kernel command line: vmalloc=256M video=tegrafb console=none usbcore.old_scheme_first=1 tegraboot=sdmmc gpt Partition layout This is an attempt to summarize and extend the current knowledge about the Acer Iconia A500 tablet.