The frozen magnetoresistance dependences of granular Bi(Pb)-HTSC samples on fields initiating a magnetic flux trapping and on magnitic reversal fields <$E R sub t (H sub i ,~H sub r )> are investigated. It is found that the <$E R sub t (H sub r )> dependences are nonmonotonous. The frozen magnetoresistance decreases substantially after the first pulse <$E H sub r> applied <$E (H sub r~<<~H sub i )> but remains practically unchanged at subsequent remagnetization by magnetic pulses of alternating polarity and of the same amplitude. The effect of magnetic reversal on magnetoresistance anisotropy and the negative magnetoresistance phenomenon are studied. Is shown that the results obtained are inconsistent with the model of critical state for SC grains and the model of SC loops but are well described quantitatively by the proposed Bi(Pb)-HTSC model according to which the magnetic flux trapping occurs in normal grains with HTSC shells and the sample resistance is determined by weak link chains.

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