Keep gupdate.gcd on-board after update?

[Butters]

@Scyllo
Bootlooping by a device is indicative of a 'soft-bricking'. You must load cure firmware in preboot mode to re-enable Mass Storage Mode so you can delete faulty files or re-format correctly. Read here: [Only registered and activated users can see links. ]

[Scyllo]

@Butters
Consequently, the following sentence refers only to flashing with the original RGN?

There's only need to delete it, if present, before updating manually by RGN or with GCD on media card.

I had suspected on the basis of your statement that a perhaps existing GUPDATE.gcd already disturbs, if the Cure file is to be flashed on the device. And I could not remove this .gcd, because the device is not recognized before flashing with the Cure file on the PC.