Add source DSi's console ID to sourceDSi_ConsoleID.txt
Add target DSi's console ID to targetDSi_ConsoleID.txt

Copy all .tik files from source DSi's /ticket/00030004/ folder to the input folder
Run tickCRYPT.bat and wait

Copy all .tik files from the output folder to target DSi's /ticket/00030004/ folder
Copy all folders from source DSi's /title/00030004/ folder to target DSi's /title/00030004/ folder

Unmount target DSi's NAND and re-encrypt

Done!