The startup file on the receiver is named `STARTUP`; it is automatically overwritten (every time the receiver reboots) with values corresponding to the selected partition.
Its location depends on the installed image:
on openATV and most other images, it is located in: `/boot`
Inside these folders, there are four additional files: `STARTUP_1`, `STARTUP_2`, `STARTUP_3`, and `STARTUP_4`
They differ from one another only by two values that identify the specific partition they reference:
To switch the receiver so it boots from a different partition, simply open the `STARTUP` file using FileZilla and modify it with one of the two strings below (designed to boot the image located in position 2 or position 3, respectively). After saving the changes to the `STARTUP` file, reboot the receiver by unplugging the power and plugging it back in.
boot emmcflash0.kernel2 'brcm_cma=440M@328M brcm_cma=192M@768M root=/dev/mmcblk0p5 rw rootwait h7_4.boxmode=1'
boot emmcflash0.kernel3 'brcm_cma=440M@328M brcm_cma=192M@768M root=/dev/mmcblk0p7 rw rootwait h7_4.boxmode=1'
Alternatively, once you are in the boot menu—suppose you want the receiver to boot from position 2—open the `startup2` file in read-only mode and copy the string. Then, go to the main `STARTUP` file, enter edit mode, delete the existing string (the one causing it to hang at 49), paste the string you copied from position 2, and save. Finally, turn the receiver off using the rear switch and turn it back on; it will now boot from position 2. Of course, you will eventually need to re-flash the position that was hanging at 49.
