So I've done several a9lh installations and they usually take about 4 hours by following Plailect's Guide step by step. 1. Is there any steps I can skip safely to make the process faster? I assume I can skip Part 5 Section 5 sysNAND-A9LHAX.bin backup? 2. I have these NAND files backup and they take up quite some space. What can I delete?