How to increase root volume & partition size on Volla phone

Please utilise the maintained variant of my Guide: Installing Sailfish X on Xperias @ GitLab!

  1. Download the RPM per web-browser, curl, pkcon download, wget etc.
  2. Either extract is content (e.g., per tar -xvf foo.rpm or rpm2cpio foo.rpm | cpio -idmv) or install it (e.g., per pkcon install-local foo.rpm), then locate the image file (an rpm -qilp foo.rpm hints where).
  3. Provide me with the output of the commands pvdisplay, vgdisplay and lvdisplay executed on the Volla phone on the regular SailfishOS installation and the exact Gigaset / Volla model used (AFAIR there are two Gigaset / Volla models supported by community builds of SailfishOS) .
  4. Determine how to trigger fastboot-mode on your Volla model, trigger it and perform a fastboot boot recovery.img on your host computer.

I will check, if the values provided in the section 3.3 ‘Increasing the “root” LVM volume size’ are fine for this model and recalculate them, if necessary.
Edit: Yes, they are for the Gigaset GS290 = the original Volla phone.

P.S.: @piggz may consider to set the root volume size to 4000 MByte (1000 * 4 MB extents, instead of 625 = 2500 MB), as Jolla already does it for the Xperia 10 II and III.
The mechanism for this is well described by these two commits:

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