  $B_1^+$ and $B_0$ field-inhomogeneities can significantly reduce accuracy and
robustness of MRF's quantitative parameter estimates. Additional $B_1^+$ and
$B_0$ calibration scans can mitigate this but add scan time and cannot be
applied retrospectively to previously collected data. Here, we proposed a
calibration-free sequence-adaptive deep-learning framework, to estimate and
correct for $B_1^+$ and $B_0$ effects of any MRF sequence. We demonstrate its
capability on arbitrary MRF sequences at 3T, where no training data were
previously obtained. Such approach can be applied to any previously-acquired
and future MRF-scans. The flexibility in directly applying this framework to
other quantitative sequences is also highlighted.
