Failed to mount /cache

[fadern]

Hi,
I have a Grouper 32gb that are looping with these two errors.

E: failed to mount /cache (invalid argument)
E: Cant mount /cache/recovery/last_locale

I have followed the guide but it still loops with the same error.
I got this error when I was flashing DivestOs from [ROM][NZH54D][2024/07/05][Asus Nexus 7 2012 WiFi/3G][F2FS/EXT4]Android 7.x AOSP.

`Kalle@SLAPTOP:~/Downloads/tegra30_debrick-master$ sudo ./fusee-launcher/fusee-launcher.py ./payload/uart_payload_n7.bin -P 7330
2024-08-28 13:15:44,668 INFO:usb.core:find(): using backend "usb.backend.libusb1"

Important note: on desktop Linux systems, we currently require an XHCI host controller.
A good way to ensure you're likely using an XHCI backend is to plug your
device into a blue 'USB 3' port.

Identified a Linux system; setting up the appropriate backend.
intermezzo_size: 0x00000078
target_payload_size: 0x000005ee
Found a Tegra with Device ID: b'11fa47d43b485d01'
Stack snapshot: b'0000000000000000100000003c9f0040'
EndpointStatus_stack_addr: 0x40009f3c
ProcessSetupPacket SP: 0x40009f30
InnerMemcpy LR stack addr: 0x40009f20
overwrite_len: 0x00004f20
overwrite_payload_off: 0x00004de0
payload_first_length: 0x000005ee
overwrite_payload_off: 0x00004de0
payload_second_length: 0x00000000
b'00a0004000300040ee05000000000000'
Setting rcm msg size to 0x00030064
RCM payload (len_insecure): b'64000300'

Setting ourselves up to smash the stack...
Payload offset of intermezzo: 0x00000074
overwrite_payload_off: 0x00004de0
overwrite_len: 0x00004f20
payload_overwrite_len: 0x00004e5c
overwrite_payload_off: 0x00004de0
smash_padding: 0x000047f2
overwrite_payload_off: 0x00004de0
Uploading payload...
txing 20480 bytes total
txing 4096 bytes (0 already sent) to buf[0] 0x40003000
txing 4096 bytes (4096 already sent) to buf[1] 0x40005000
txing 4096 bytes (8192 already sent) to buf[0] 0x40003000
txing 4096 bytes (12288 already sent) to buf[1] 0x40005000
txing 4096 bytes (16384 already sent) to buf[0] 0x40003000
Smashing the stack...
sending status request with length 0x00004f20
The USB device stopped responding-- sure smells like we've smashed its stack. :)
Launch complete!
kalle@SLAPTOP:~/Downloads/tegra30_debrick-master$ sudo ./utils/nvflash_v1.13.87205_miniloader_patched --setbct --bct ./bct/nexus_7_grouper_bct.bin --configfile ./utils/flash.cfg --bl ./bootloader/bootloader-grouper-4.23.img --goNvflash v1.13.87205 started
chip uid from BR is: 0x0000000000000000015d483bd447fa11
rcm version 0X30001
System Information:
chip name: unknown
chip id: 0x30 major: 1 minor: 3
chip sku: 0x83
chip uid: 0x0000000000000000015d483bd447fa11
macrovision: disabled
hdcp: enabled
jtag: disabled
sbk burned: true
dk burned: true
boot device: emmc
operating mode: 3
device config strap: 2
device config fuse: 17
sdram config strap: 1

sending file: ./bct/nexus_7_grouper_bct.bin

• 6128/6128 bytes sent
  ./bct/nexus_7_grouper_bct.bin sent successfully
  downloading bootloader -- load address: 0x80108000 entry point: 0x80108000
  sending file: ./bootloader/bootloader-grouper-4.23.img
• 2150992/2150992 bytes sent
  ./bootloader/bootloader-grouper-4.23.img sent successfully
  waiting for bootloader to initialize
  bootloader downloaded successfully
  kalle@SLAPTOP:~/Downloads/tegra30_debrick-master$ sudo ./utils/nvflash_v1.13.87205_miniloader_patched --resume --download EBT bootloader/bootloader-grouper-4.23.img --configfile ./utils/flash.cfg
  Nvflash v1.13.87205 started
  [resume mode]
  sending file: bootloader/bootloader-grouper-4.23.img
• 2150992/2150992 bytes sent
  bootloader/bootloader-grouper-4.23.img sent successfully
  `

[tofurky]

i don't see the error you mentioned in the output. cache is blank by default so i'd just boot into fastboot and fastboot format cache

[fadern]

Hi, I'm not able to access fastboot. The tablet are looping. Please see the attached screenshot.

…

On Wed, Aug 28, 2024, 22:26 tofurky ***@***.***> wrote: i don't see the error you mentioned in the output. cache is blank by default so i'd just boot into fastboot and fastboot format cache — Reply to this email directly, view it on GitHub <#17 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGZYKRAWC4SRMK35XOKQYWLZTYXANAVCNFSM6AAAAABNIC6TPKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGMJWGE4TANJXGU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[fadern]

[tofurky]

fastboot is on there as you wouldn't get to the recovery screen without it: Press and hold Volume Down, then press and hold Power.

see if it enumerates in fastboot mode. i'd do it while it's connected to a linux system with dmesg -Tw running in a terminal so you can see everything it's doing via usb.

if it does, try the fastboot format cache.

but you say it's looping? so it goes to the exclamation mark screen then immediately reboots itself back to "E: failed to mount /cache" and then to the rescue screen again?

[fadern]

flash.cfg.txt
partitions.txt
So I tried to boot it to fastboot mode but it always ends up in the failed to mount cache loop. The dmesg -Tw doesent show any new entries while i'm trying to access fastboot.
the google logo flashes two time before the loop.
I'm however able to access APx mode.

[fre aug 30 09:58:07 2024] usb 3-1: new high-speed USB device number 5 using xhci_hcd
[fre aug 30 09:58:07 2024] usb 3-1: New USB device found, idVendor=0955, idProduct=7330, bcdDevice= 1.03
[fre aug 30 09:58:07 2024] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[fre aug 30 09:58:07 2024] usb 3-1: Product: APX
[fre aug 30 09:58:07 2024] usb 3-1: Manufacturer: NVIDIA Corp.

Could it be that my partition tables got corrupt or do I need to format cache? I believe that my former rom was f2fs cache...

[fadern]

Formating cache didnt help... Still same error.

./utils/nvflash_v1.13.87205 --resume --format_partition 10
Nvflash v1.13.87205 started
[resume mode]
Formatting partition 10 CAC please wait.. done!

[fadern]

I managed to flash twrp and it was access able (once). Then i formated the cache to ext3 and then back to etx4. Then I rebooted. It didnt work. Back to APX...

root@SLAPTOP:/home/kalle/Downloads/tegra30_debrick-master# sudo ./utils/nvflash_v1.13.87205_miniloader_patched --resume --download SOS twrp.img --configfile ./utils/flash.cfg
Nvflash v1.13.87205 started
[resume mode]
sending file: twrp.img
\ 11098112/11098112 bytes sent
twrp.img sent successfully

[fre aug 30 13:14:28 2024] usb 3-1: Product: APX
[fre aug 30 13:14:28 2024] usb 3-1: Manufacturer: NVIDIA Corp.
[fre aug 30 13:14:58 2024] usb 3-1: USB disconnect, device number 54
[fre aug 30 13:15:08 2024] usb 3-1: new high-speed USB device number 55 using xhci_hcd
[fre aug 30 13:15:09 2024] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee7, bcdDevice=99.99
[fre aug 30 13:15:09 2024] usb 3-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
[fre aug 30 13:15:09 2024] usb 3-1: Product: Android
[fre aug 30 13:15:09 2024] usb 3-1: Manufacturer: Android
[fre aug 30 13:15:09 2024] usb 3-1: SerialNumber: 015d483bd447fa11

But suddenly it showed the google logo and now I see it in lsusb and adb devices.

root@SLAPTOP:/home/kalle# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 04f2:b230 Chicony Electronics Co., Ltd Integrated HP HD Webcam
Bus 001 Device 004: ID 8086:0189 Intel Corp. Centrino Advanced-N 6230 Bluetooth adapter
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 003: ID 138a:003c Validity Sensors, Inc. VFS471 Fingerprint Reader
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 055: ID 18d1:4ee7 Google Inc. Nexus/Pixel Device (charging + debug)
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

root@SLAPTOP:/home/kalle# adb devices
* daemon not running; starting now at tcp:5037
* daemon started successfully
List of devices attached
015d483bd447fa11        device

[fadern]

ok, now I solved it.

After the "cache wipe/format/(ext4->ext3->ext4)" using twrp I followed your guide once more and then I was able to access fastboot. From there I installed DivestOS.

Thank you!