Need Help to execute concurrent kernels on tegra jetson tk1. Link to 19.1 drivers and file system

Hi I am developing an Image processing application by CUDA - C on Tegra Jetson TK1 with l4t 19.1 with CUDA toolkit 6.0.

For my Application I need to implement concurrent kernels. I have Tried on Tegra Jetson TK1 but I failed.I ran the same code on other GPU it successfully launched concurrent kernels.

So I have search on Web and I found that in l4t 19.2 CUDA Streams facility was broken.So I came with a solution to degrade my Tegra Board to l4t 19.1 so that I can run concurrent kernels to optimize.

Please Provide me a link to l4t 19.1 drivers and filesystem.

please could you update on progress?