A realm of devices from the late 00s, that primary served the purpose of allowing messaging on the go without being a smartphone. They usually were catered for accessing e-Mail accounts, IRC servers, or IM platforms like AIM. For the most part, they run ARM chips and a Linux-based OS.
low level access to Flash memory via JTAG is now doable
While this device originally ran Linux, and was intended to be a lightweight portable e-Mail messenger, hackers quickly turned it into a little uClinux device. How much it can do isn’t highly covered, but the creators of this device encouraged hacking of it.
https://en.wikipedia.org/wiki/Peek_(mobile_Internet_device)
https://web.archive.org/web/20110207162723/http://peeklinux.com/index.php/Main_Page
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https://web.archive.org/web/20131126191831/http://linux.zipitwireless.com/