Development of German atomic weapons were not nearly as advanced as believed and certainly no where near the development of a H-bomb when the war ended.
While there is speculation the Germans exploded two dirty bombs in the last weeks of the war, the reality is they were at least three years from completion of a Hiroshima device.
Quite simply the reasons why the Germans lagged behind in atomic development was a lack of concentrated development with teams of scientists competing against each other and a very low funding level.
Overall the German effort to produce atomic weapons was miniscule in comparison to the Manhatten Project.
Regards to all,
Digger.