Help in resetting an HP-50G

[Namir]

(09-26-2020 07:09 PM)acoto Wrote:  Part of my standard routine when getting a new HP-50 is to re-flash to standard image. Even if it came with in latest software version.

Also re-flashed a lot of times going back and forth between standard and NewRPL images. Not a single issue so far.

Good instructions here.
https://www.hpcalc.org/hp49/pc/rom/

2.15 firmware is my favorite.
https://www.hpcalc.org/details/7097

I use the files inside "2M FIX.zip", as they will wipe out everything, and truly revert Flash to factory conditions. It includes Equation library.

Try to recover Memory: "NO" after the upgrade is the perfect end for old data (and any weird behavior). If no dialog is presented "ON A F" key combination will send you to it.

Also remember to use standard SD card (not SDHC), formatted in FAT16. 1GB ( or smaller) card recommended.

iPhone SIM eject tool is great to push the HP50 reset button.

Yes I installed firmware version 2.15 on that HP-50G. I realized using the SD cards were very simple.

I am glad that Joe's instructions put an end to my nightmare! Admittedly, the developer(s) of the Surveying app were very good! They installed icon-based menus and maintained a series of folders on the SD card. The annoying thing was keys like SIN, COS, TAN, and so on were redefined!

Namir