Just to save a bit of time by bringing together available resources, although this is essential reading:https://wiki.maemo.org/Resurrect_your_N9

When you are ready to dig a bit deeper have a look at:https://wiki.maemo.org/Harmattan_Tips_and_Workarounds/

If device has been left untouched for too long may need to revive battery via Harmattan flasher:http://talk.maemo.org/showthread.php?t=87709

Please bear in mind in view of age of device that it may be necessary to set date of device to between 2013 -15 quite early in re-commissioning if eliciting "signature check failed" at any stage.

1) Flashing if needed, have a look here for firmware:http://talk.maemo.org/showthread.php?t=96401 and here is source of Harmattan flasher courtesy of coderus:
https://coderus.openrepos.net/flasher/

Should WebArchive be very slow 001, 003 & 005 can be found here:
https://mega.nz/#F!VvB1wDyZ!d1kjm6u0...eoIZg!MvBmXLBC and 009 here:
https://www.dropbox.com/s/8h38ukdgp3...8_ARM.bin?dl=0


2) Upon N9 open Settings/Applications/Installations, and enable the option 'Allow installations from Non-Store sources'.

3) Point N9 browser to this link to disable Nokia repositories after installation: https://openrepos.net/content/ancelad/n9-repomirror

4) Enable Developer Mode in Settings > Security which should install Terminal and SDK-Connectivity-Tool

5) Install N9QTweak: https://openrepos.net/content/schturman/n950-quicktweak

6) Redirect connectivity-test.ext.nokia.com to connectivity-test-ext.maemo.org via entry in hosts file:http://talk.maemo.org/showpost.php?p...5&postcount=83

7) Disable Nokia account prompt when SIM in place:http://talk.maemo.org/showpost.php?p...0&postcount=53

8) Bypassing Nokia account requirement in Maps & Drive:http://talk.maemo.org/showpost.php?p...39&postcount=1

Since map servers were eventually closed in early June 2018 by German car makers consortium whom bought HERE mapping now prioritising Android & iOS, additional map data can be found for manual installation here:http://maps.tienda-sistore.com

For any Mac users you do need to use recursive command in Terminal to combine regions/states for manual installation of mapping data. Unfortunately this tutorial can no longer be brought up to date due to lack of sufficient privileges, but gives the idea:https://answers.microsoft.com/en-us/...c-cb77bcef0f06

Delving deeper remember that commonly used apps such as GPSMeeFo require you to reset date upon N9 to 2015 for installation and Coderus trusted Harmattan repository can be essential to track down missing dependencies when say installing BtInput app:http://talk.maemo.org/showpost.php?p...66&postcount=1

At this point if not before you should install coderus aegis installer hack either via http://talk.maemo.org/showpost.php?p...79&postcount=1 or through N9QTweak Tweak EE > 2 (Coderus Aegis-install) to allow installation of apps. via Emojifix - after installation of harmoji_0.6.6_armel.deb need to install libsms-utils0_0.5.17.3+0m7_armel.deb and libsms-utils0_0.5.17.3+0m7_armel-mod.deb from here via Terminal:https://talk.maemo.org/showpost.php?...&postcount=132

Here is example of installing btinput where Warehouse seems to fail locating repository so dependencies have to be sourced manually:http://talk.maemo.org/showthread.php?t=98797

Make text size larger in Messaging, tutorial in use of feature in N9QTweak:https://nokiaindependent.wordpress.c...ssages-app-n9/