The Wormhole wrote:
It would make no sense if Klingons have cloaking devices given in the Prime Universe they got them from the Romulans in the technology trade that resulted in the Romulans using D-7s.
The Romulans got D7's from the Klingons, but that the Klingons got cloaking devices in exchange is pure fanon. Like the Klingon Bird of Prey being a Romulan design (fanon stemming from an early STIII script where it was the case), the idea that Klingons got their cloaks from the Romulans is obsolete.
Maybe they got them from the Xyrillians, along with their holographic tech.