Just hoping to confirm before I get started

[Quinterly]

Hi,

This tool looks great and I'll definitely send a cup of coffee but have a couple of questions before I get started. Want to make sure I don't mess up.

I have a 2018 RS3 (Canada) with MHI2_US_AU37x_P4263 (MU: 1368). There is no corresponding patch file for this version of the firmware. MIB-Helper shows a newer firmware version that does have a patch (MHI2_US_AU37X_K5512 (MU: 1484)) but I don't want to flash it because there's no reason and I have to order an OBDEleven or similar to disable MOST for my B&O sound (I've already had one OBDEleven stolen).

With that background:

1. I assume that M.I.B. won't patch anything and I need to upload my backup so that you can make sure that the ifs-root file is the same as the MU1484 patch) and then I just need to rename the folder?
2. By external power, I am assuming that a battery maintainer/trickle charger is sufficient? The car won't shut down during the flash if there's a maintainer connected?

I also have a maps question. The file directly linked in MIB-Helper doesn't download. There are a couple of different maps on the site for NAR (one starts with P356 the other with P376. Is there a way of knowing which is the right one?

Thanks!