A method for producing a flexibly rolled flat steel product having a final thickness required in sections from a high-strength steel containing manganese with a tensile strength Rm of more than 1000 MPa to 2000 MPa and an elongation at break A50 of more than 3% to 45% in the most deformed areas of the flat steel product, comprising the steps of: - melting of a steel melt with an alloy composition containing (in wt.%): C: 0.05 to 0.35; Mn: > 5 to < 10; Al: 0.05 to 5; P: < 0.1; S: < 0.1; N: < 0.1; balance iron including unavoidable steel accompanying elements, with optional alloying of one or more of the following elements (in wt.%): Si: up to 6; Cr: up to 6; Nb: up to 1; V: up to 1.5; Ti: up to 1.5; Mo: up to 3; Sn: up to 0.5; Cu: up to 3; W: up to 5; Co: up to 8; Zr: up to 0.5; Ta: up to 0.5; Te: up to 0.5: B: up to 0.15, via the blast furnace steelworks or electric arc furnace steelworks process route with optional vacuum treatment of the melt, - casting the molten steel to form a pre-strip by means of a near-net-shape horizontal or vertical strip casting method or casting the steel melt to form a slab or thin slab by means of a horizontal or vertical slab or thin slab casting process, - heating the pre-strip or the slab or thin slab to a temperature of 1050 to 1250°C or inline rolling from the casting heat (first heat), - hot rolling to a uniform final thickness of 20 to 0.8 mm at a final rolling temperature of 1050 to 800°C, - coiling the hot strip at a coiling temperature of more than 100 to 800°C, - pickling the hot strip - annealing of the hot strip at a temperature of 500 to 840°C for a time of 1 min to 24 h in a continuous or bell annealer, - optional cold rolling of the hot strip to a uniform final thickness at room temperature or at an elevated temperature in one or more rolling passes, - optional annealing of the cold-rolled hot strip at a temperature of 500 to 840°C for 1 min to 24 h in a continuous or bell annealer - flexible rolling of the hot or cold strip in one or more rolling steps to the final thicknesses required in sections with a temperature of the hot or cold strip of 60°C to below Ac3, preferably of 60°C to 450°C, before the first rolling step, - optional electrolytic galvanizing or hot-dip galvanizing of the hot or cold rolled strip or application of another metallic, organic or inorganic coating before or after flexible rolling. - melting of a steel melt with an alloy composition containing (in wt.%): C: 0.05 to 0.35; Mn: > 5 to < 10; Al: 0.05 to 5; P: < 0.1; S: < 0.1; N: < 0.1; balance iron including unavoidable steel accompanying elements, with optional alloying of one or more of the following elements (in wt.%): Si: up to 6; Cr: up to 6; Nb: up to 1; V: up to 1.5; Ti: up to 1.5; Mo: up to 3; Sn: up to 0.5; Cu: up to 3; W: up to 5; Co: up to 8; Zr: up to 0.5; Ta: up to 0.5; Te: up to 0.5: B: up to 0.15, via the blast furnace steelworks or electric arc furnace steelworks process route with optional vacuum treatment of the melt, - casting the molten steel to form a pre-strip by means of a near-net-shape horizontal or vertical strip casting method or casting the steel melt to form a slab or thin slab by means of a horizontal or vertical slab or thin slab casting process, - heating the pre-strip or the slab or thin slab to a temperature of 1050 to 1250°C or inline rolling from the casting heat (first heat), - hot rolling to a uniform final thickness of 20 to 0.8 mm at a final rolling temperature of 1050 to 800°C, - coiling the hot strip at a coiling temperature of more than 100 to 800°C, - pickling the hot strip - annealing of the hot strip at a temperature of 500 to 840°C for a time of 1 min to 24 h in a continuous or bell annealer, - optional cold rolling of the hot strip to a uniform final thickness at room temperature or at an elevated temperature in one or more rolling passes, - optional annealing of the cold-rolled hot strip at a temperature of 500 to 840°C for 1 min to 24 h in a continuous or bell annealer - flexible rolling of the hot or cold strip in one or more rolling steps to the final thicknesses required in sections with a temperature of the hot or cold strip of 60°C to below Ac3, preferably of 60°C to 450°C, before the first rolling step, - optional electrolytic galvanizing or hot-dip galvanizing of the hot or cold rolled strip or application of another metallic, organic or inorganic coating before or after flexible rolling.