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The \textsc{Gerda} experiment searches for the neutrinoless double beta($0\nu\beta$beta$) decay of $^{76}$Ge using high-purity germanium detectorsmade of material enriched in $^{76}$Ge. For Phase II of the experiment asensitivity for the half life $T_{1/2}^{0\nu}\,\,\sim2\cdot10^{26}$ yr isenvisioned. Modified Broad Energy Germanium detectors (BEGe) with thick n$^+$electrodes provide the capability to efficiently identify and reject backgroundevents, while keeping a large acceptance for the $0\nu\beta$beta$-decay signalthrough novel pulse-shape discrimination (PSD) techniques.  The viability of producing thick-window BEGe-type detectors for the\textsc{Gerda} experiment is demonstrated by testing all the production stepsfrom the procurement of isotopically modified germanium up to working BEGedetectors. Comprehensive testing of the spectroscopic as well as PSDperformance of the \textsc{Gerda} Phase II prototype BEGe detectors proved thatthe properties of these detectors are identical to those produced previouslyfrom natural germanium material following the standard production line of themanufacturer.  Furthermore, the production of BEGe detectors from a limited amount ofisotopically modified germanium served to optimize the production, in order tomaximize the overall detector mass yield. The results of this test campaignprovided direct input for the subsequent production of the enriched germaniumdetectors.

Isotopically modified Ge detectors for {\sc Gerda}: from production to operation