[Q] not booting recovery

GloriousDJ said:

I know how to boot into recovery, that's not the problem, the problem is it wont load CWM recovery at all, it says loading recovery and it should only take a few seconds but I left it for 5 minutes and still said the same thing.

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GloriousDJ said:

I have used ADB for my phone before, I don't have a copy of my UID number but the I can still get on the beta3 so its not stuck in a boot loop or something so I think I could get it. Thanks for the idea, I guess I can try that see if I can get it working that way.

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Moscow Desire said:

Hope you have a backup copy of your UID number. I think you will probably need it.

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#include <libusb-1.0/libusb.h>
#include <stdio.h>
#include <stdint.h>

int main(void)
{
    unsigned char data[64];
    int received_length;
    int r = 1;
    libusb_context* ctx = NULL;
    libusb_device_handle* dev_handle = NULL;

    libusb_init(&ctx);
    dev_handle = libusb_open_device_with_vid_pid(ctx, 0x0955, 0x7820);
    if(dev_handle)
    {
        r = libusb_bulk_transfer(dev_handle, 0x81, data, sizeof(data), &received_length, 10000);
        if (r == 0)
        {
            if(received_length == 8)
            {
                printf("uid: %#016lx\n", *(uint64_t*)data);
            }
            else
            {
                r = 1;
                printf("Error: We got %d bytes of data insetad of the 8 bytes we expected...\n", received_length);
            }
        }
        else
        {
            printf("Error: USB read failed!\n");
        }
        libusb_release_interface(dev_handle, 0);
    }
    else
    {
        printf("Error: Failed to open device!\n");
    }
    libusb_exit(ctx);
    return r;
}

GloriousDJ said:

I flashed Lightspeed_4_beta3 after that came out and I finally made the time to try and update to the newest version 4.3 today, but I can't get into recovery, I have Acer Recovery app and I re-installed CWM but it still wont load recovery... any ideas why? and how to fix it?

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eppeP said:

Unless I have misinterpreted something, this should not be that much of a problem. Maybe a bit inconvenient if you don't know USB programming though.

If you can get the device into APX mode it will answer the first read request with the UID.
So if you open the device (955:7820) and initiate a bulk transfer on endpoint 0x81 and you should get 8 bytes that is the UID.

Something like:

Code:

#include <libusb-1.0/libusb.h>
#include <stdio.h>
#include <stdint.h>

int main(void)
{
    unsigned char data[64];
    int received_length;
    int r = 1;
    libusb_context* ctx = NULL;
    libusb_device_handle* dev_handle = NULL;

    libusb_init(&ctx);
    dev_handle = libusb_open_device_with_vid_pid(ctx, 0x0955, 0x7820);
    if(dev_handle)
    {
        r = libusb_bulk_transfer(dev_handle, 0x81, data, sizeof(data), &received_length, 10000);
        if (r == 0)
        {
            if(received_length == 8)
            {
                printf("uid: %#016lx\n", *(uint64_t*)data);
            }
            else
            {
                r = 1;
                printf("Error: We got %d bytes of data insetad of the 8 bytes we expected...\n", received_length);
            }
        }
        else
        {
            printf("Error: USB read failed!\n");
        }
        libusb_release_interface(dev_handle, 0);
    }
    else
    {
        printf("Error: Failed to open device!\n");
    }
    libusb_exit(ctx);
    return r;
}

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liftman- said:

First thanks
having a hard time compiling in ubuntu
output is:

lr@lr:~/a500$ gcc -Wall -W -Werror apx.c -o apx
/tmp/ccNiYNxr.o: In function `main':
apx.c.text+0x36): undefined reference to `libusb_init'
apx.c.text+0x4c): undefined reference to `libusb_open_device_with_vid_pid'
apx.c.text+0x82): undefined reference to `libusb_bulk_transfer'
apx.c.text+0xec): undefined reference to `libusb_release_interface'
apx.c.text+0x104): undefined reference to `libusb_exit'
collect2: ld returned 1 exit status

any ideas for me?

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gcc apx.c -o apx -lusb-1.0

lcd047 said:

Try linking against libusb-1.0:

Code:

gcc apx.c -o apx -lusb-1.0

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eppeP said:

Unless I have misinterpreted something, this should not be that much of a problem. Maybe a bit inconvenient if you don't know USB programming though.

If you can get the device into APX mode it will answer the first read request with the UID.
So if you open the device (955:7820) and initiate a bulk transfer on endpoint 0x81 and you should get 8 bytes that is the UID.

Something like:

Code:

#include <libusb-1.0/libusb.h>
#include <stdio.h>
#include <stdint.h>

int main(void)
{
    unsigned char data[64];
    int received_length;
    int r = 1;
    libusb_context* ctx = NULL;
    libusb_device_handle* dev_handle = NULL;

    libusb_init(&ctx);
    dev_handle = libusb_open_device_with_vid_pid(ctx, 0x0955, 0x7820);
    if(dev_handle)
    {
        r = libusb_bulk_transfer(dev_handle, 0x81, data, sizeof(data), &received_length, 10000);
        if (r == 0)
        {
            if(received_length == 8)
            {
                printf("uid: %#016lx\n", *(uint64_t*)data);
            }
            else
            {
                r = 1;
                printf("Error: We got %d bytes of data insetad of the 8 bytes we expected...\n", received_length);
            }
        }
        else
        {
            printf("Error: USB read failed!\n");
        }
        libusb_release_interface(dev_handle, 0);
    }
    else
    {
        printf("Error: Failed to open device!\n");
    }
    libusb_exit(ctx);
    return r;
}

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jecee said:

Hi, eppeP,
I downloaded the drivers for lib Usb and installed, I am missing something definately as I dont know how to read the CPUID after installing the drivers
Please help....

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