You can use free Samsung firmware update tools to download the Samsung SM-P601 stock ROM to your desktop which can be flashed with the Odin flashing tool.
SamFirm_Reborn
One of the most commonly used tools to download Samsung firmware is SamFirm_Reborn. All you need is your smartphone model number and its region and then the tool will search Samsung;’s servers for your latest firmware file. Most people use this tool because its name is so similar to the original SamFirm tool which had a monopoly position as a tool for downloading Samsung firmware. But many other tools are also forks of the original SamFirm tool.
SamFwTool
One of the best forks of SamFirm is SamFwTool. It’s similar to SamFirm_Reborn but it’s easier to use for those who struggle inputting the region and model number data thanks to its auto-detect feature that tries to automatically detect what smartphone it is that you have. Apart from its auto-detect feature, the two tools are pretty similar: both download Samsung firmware directly from Samsung’s servers to your desktop. You can also use the Odin flashing tool for the firmware file you download from the SamFwTool.
Bifrost – Samsung Firmware Downloader
Both options above are for Windows computers only. If you don’t have Windows, you need to use Bifrost – Samsung Firmware Downloader instead. All you need for this tool is Python 3 rather than an operating system. This was originally a command line tool but has since been updated to show a user interface equal to the other options. Bifrost – Samsung Firmware Downloader also has an auto-detect feature so you don’t have to manually input your region and model number which can sometimes be difficult.